Just a Note, If you don't hear door switch, it may be bad. Hearing it does not mean it is working or wires didn't come off switch.

Certified doesn't always mean Competent or Qualified. Change the Board and see if that is it? We call them Board Changers. I would do some testing before Buying a Board, Many are quick and Cheap test. But Need to be done. Did you test Thermals. Actually test Door Switch. We can help if you are able to do these, Sounds Like another Dryer is on the way.
Here is Where I mentioned earlier, Good Luck whatever you do.
http://www.appliancepartspros.com/se...el=ylte6234dq0

Haven't been able to figure out anything. Since we managed to get a good discount at Best Buy we decided to buy a new one. Thanks again for all the help! I've learned something new :)

That's a good decision, glad you have peace of mind now. Sometimes it's worth just plucking down the bucks to get what you need and be done with the stress and the mess.