After 4 years of regular use (about 2-3 times a month), our washer flashed the "PE" error code (The water level sensor is not working correctly). LG's solution states, 'Close the water faucets, unplug the washer, and call for service." How convenient. I tried the reset route (after Googling for other solutions) -- unplugged, wait for a minute, plug back in and pray the error code would disappear. Nope. The error code won't go away. It was time to roll up the sleeves and crack open the unit.Our washer and drier are located outdoor -- an open but roofed patio. So, they're prone to malfunctions from both the elements and uninvited nightcrawlers. Thankfully, the LG WT1501CW is easy to take apart for servicing and for DIY'ers like myself. Just a few house tools: Phillips screwdriver, scissors, a pair of wide paint scrapers, and in our case, a roll of electrical tape, a wire crimping kit & a multimeter/tester, were all I used. That plus basic knowledge of electricity/electronics would help. Always UNPLUG the AC power cord before even attempting to loosen the first screw.We were prepared to fork out another $700 for a similar model washer but all we spent was about $30 for both this new water level sensor switch assembly ($21.39 tax inclusive) and a new dispenser hose ($7.72 tax inclusive). The hose connects from the bleach holder to the leftmost tube in the same compartment where the water level sensor is located -- the top, back end of the washer.While we slept, 'friendly four-legged creatures' gnawed on the black, rubber hose that conveys bleach, a few wires that came out of the noise suppressor (a white square box that sits atop a removable metal plate - immediately to the right of the water level sensor (WLS)) & the violet-colored wire on the 3-wire connector that plugs into and powers the WLS. Further inspection showed that the mouse also gnawed a couple of small, blue wires at the bottom of the unit and a small area of the clear hose attached to the WLS.The mouse was able to gain access to that seemingly sealed top compartment from below the washer, climbed up the unit via the metal rods that support the washer drum, gnawed the bleach hose to make a nice home inside that rear compartment while he feasted on those yummy wire harness.After replacing all the chewed-up wires, the rubber bleach hose, and the WLS itself, the unit was immediately ready for the next load of dirty laundry. The replacement WLS unit was the same brand and had the same length of clear tubing and a small black pad as the original. Just use the same metal clip when connecting the other end of the clear tube at the back, mid-part of the washer (after you removed the metal back cover held by four (4) short, self-tapping screws).The plastic rear, top cover that houses the WLS, noise suppressor, tubes, and an assortment of wires is held by only two (2) Phillips-type screws. Then use the wide paint scrapers to gently pry and separate the cover via the gaps once the 2 screws were removed. With the cover removed, you might be overwhelmed by the jumble of wires. You will easily sort everything out as the wires and where they connect to are mostly color-coded.To remove the top cover completely, you need to remove four (4) screws - two (2) long screws (hidden by small, round plastic cover plates at both ends of the main control panel) and the two (2) fat but short screws on the vertical slats of the washer at the back.The WLS clear tubing is bundled up with some other wire harness as it goes down the washer and wraps around twice on the left (when facing the washer from the back) metal rod that supports the washer drum. Use a sharp scissor to carefully cut the synthetic cloth (as extra insulation/padding) to separate the tubing from all the other wires.Overall, in less than an hour (if all the rest of the wires & hoses have no issues or damage) or two (like ours with all the chewed-up wires and bleach hose damage (for that, I had to pry open the entire top of the washer to connect & clamp securely one end of the new black rubber hose to the bleach dispenser cup located under the top, left portion of the washer), you'll get your LG WT1501CW (or, similar LG model top-loading washer) back in action.And, save yourself a lot of money in the process.