Washing machine is simple. Various functions work sometime and at other times have to try other cycle to activate them. Is there much other than the controller that would go bad in this unit. Sometimes either hot or cold water doesn't work, and now it just fills without controller dial moving, but rinse and spin work. Has lost its way. Wanted to know if the controller is probably the culprit and if it is worth replacing? If so, is the repair simple for the skilled?