See if you can use a meter to determine if power is getting to the lock mechanism when it is supposed to. If not, trace back the wiring to see if you can find where it is at fault.

If that fails try to put the machine in a diagnosis/troubeshooting mode and see if you can generate or retrieve and error code.

Here is the service manual which will show you how. You have the "better" version of this model.

http://frigidaireservicetips.co...rizontalAxisWasherSM.pdf