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Dryer was leaving marks on clothing
You must disconnect appliance from the gas, water and vent to access the back. Remove the top of the dryer which then allows you to remove the rear panel by removing all screws, You may also have to remove 2 electrical connections to get this panel off. Now you have access to the air duct. To remove the air duct there are 3 screws inside the dryer and 2 screws on the lower part of the air duct. One of the lower screws is facing toward the inside of the dryer and you will need a 12"+ screwdriver to be able to remove. Once you do all that install the new part and repeat steps in reverse.
Heating element went out so I ordered this replacement and installed it myself
Getting to the element and putting the machine back together, in my case, was the most difficult part. There are tons of youtube videos that can guide you through the removal and replacement better than I can. I recomend watching those videos and taking pictures of the old element prior to removing it. Also, I would put all the screws in separate ziplock bags with labels on them because every screw for my model was unique. I would also tape and label the electrical wires too.
I removed the front, top and back panels of the dryer, installed belt around drum and through the pulley system so the belt was snug, replaced all screws and panels, and done.
I researched possible causes on line and watched a PartsSelect video on YouTube on how to test. I ended up misreading test results and ordered the High Limit Thermostat but subsequently realized problem was the Terminal Block. No problem, PartsSelect took back the Thermostat (I hadn't installed it) and shipped me the Terminal Block. My dryer was back up and running in less than 7 days from initial analysis to installation of Terminal Block. Instructions that came in confirmation email for installation were perfect and easy to follow. Total cost with new power cord from Home Depot was less than $50 vs a quoted service call of $175+ parts from local electrician.
error code 63 I checked all componenets and wiring for resistance. everything checked ok. noticed charring on the copper contacts in the control board.
removed the top of the cabinet,unplugged wiring from control board, removed screws fastening control board and installed new control board.