Buttons on face won't respond. i went into diagnostic mode and got a f22 code so i changed the door lock assembly as some websites recommended. after that it worked one time and went back to the same issue. my model number is Wfw9400sw01. websites are telling me to change the ccu. thoughts? is that located in the top right just inside the lid? i have unplugged and replugged all the modular plugs in this board and have been able to wash a couple of loads but it's still throwing a F22 code and not working. Thanks