It took me about 4 hours, but the time was well spent. My Whirlpool WGD5500SQ0 dryer was about 15 years old and while it worked. Was no longer heating. I contemplated buying a new one but except for its age, it looked almost new and I was not about to throw away a perfectly good machine. I opened up the back panel and tested the fuses. The thermal fuse was bad so I ordered one and replaced it but that did not solve the problem. The igniter glowed every few minutes and went off without lighting. I decided that either the flame sensor or the gas coils were bad. If I was going to pull the drum. I decided to change out the parts that could be causing this and any future problems. I ordered a flame sensor. Gas coils and a new igniter. After watching the repair videos I went to work. I removed the drum and replaced the parts following the instructions in the videos. I plugged it in turned on the gas and crossed my fingers. It ran for about 10 seconds the threw off so much heat that made me realize that for the past few years it had not been heating as efficiently as when it was new. No wonder my wife always ran it on the high setting. She has no need to do that now as it heats like an oven. Thanks for the speedy delivery of the parts, Appliance Parts Pros.