We have a catalyst washer model number GSX9885JQ0. My wife said it stopped agitating. I did the diagnostic steps given in the control panel and it agitates fine. The only thing that it didn't do was drain out of the machine on the drain test. It recirculated OK. During a wash cycle it actually agitates until it about four minutes have passed and it sticks, continually recirculating and spinning. It doesn't shut off. My first thought is the circuit board but electronic parts can't be returned. I would hate to spend $120.00 and that not be the answer. Any help would be appreciated.

Look carefully at the circuit board for any burn marks

I checked both front and back of the circuit board. No obvious scorch marks are there.