Thanks for the question.
Does the water pump smell like its burnt you should be able to smell it.
You have had it apart to clean out the coins so just remove the two screws and remove the two hoses .
Yes that would be a burnt up pump if you found the black residue in the pump.
Replace the pump it should fix the problem.
I was checking the problem and came up with this from G E .
Its a recall problem that I want aware of.
Call G E to have the problem repaired Free of charge.
Well your not the only customer having this problem and G E doesnt seem to know whats causing the problem.
I would call G E for this problem it should be covered under Warranty.
Well Ive never heard of a drum having to be replaced because it rubbed on a gasket especially when it wasn't leaking water.