About the $3.50 MOSFET, as you well know, everybody cant know everything. Appliance servicing involves very little formal electronic repair training, and this is something you hear from a few people "I took it to a TV repair place and he fixed the fault in the board for $50". But the big thing is it took him 1 hour, and 20 years in the electronics industry, to fix it. And they had to wait a week for it, after the repair guy had been out and told them what was wrong. I can understand the frustration people feel especially when they have bought a new washer, but he was probably not trying to rip you off, but just doesnt know about the finer points of electronics.
Regarding the Washer, F+P are a very resonable company to deal with, phone them with a date of sale and a serial no and see what they say.
Although it may be best if you reassemble the machine before the repair guy arrives.
, and maybe dont tell F+P about the stator, as you will be admiting to voiding the warranty.
Good luck, and let us know how you get on.