These places say they will help you diagnose your problem. The first three places are associated in some way I don't understand. The last time I hunted for help at the second and third places they weren't very helpful, but I didn't spend a lot of time trying.
http://www.applianceaid.com Here's a appliance repair forum associated with this website. Takes about a day to get a reply from a very helpful guy whose username is jeff1, but I've gotten solutions to a refrigerator problem, a gas dryer problem, a clothes washer problem, a microwave problem and a range problem here. I'm impressed.
I ordered a part from this website in June 2013. They were pleasant on the phone shipped prompted and had the best return/replacement policy I've run across.
http://www.repairclinic.com/0003.asp - [Note: I asked this place for help finding a part number for my failed air conditioner indoor fan relay. When they didn't reply in two days (other than an autoreply form email saying they'd answer within 24 hours), I sent a follow-up with my case number asking if they intended to help me. They never bothered to answer either inquiry. I won't be using them again.]
Another appliance repair website with some repair guides (slide to the bottom of the page)