Dishwasher appears to be stuck in child lock mode though the lock light is not lit. Pressing Heated Dry button for 3 secs. has no effect. Start/Reset and Delayed Start buttons work. Cycled power to unit and no luck. Tried to put in service mode by holding down arrow and Heated Dry for 3 seconds. No luck. Is it the control pad that is bad or the timer module, or is there a way to reset?