Power button would not turn unit on. Verified power was getting to unit by turning on and off light. Performed diagnostics for error codes. Received F02 (Keypad/User Interface failure) error code. Performed troubleshooting per manual and replaced interface control board PN: W10280044. This fixed power button failure but unit wouldn't operate. Performed diagnostics for error codes. Received F70 (No communication between the electronic control board and the user interface control board assemblies). Performed troubleshooting per manual and replaced main control board PN: WPW10256719. Performed diagnostics to verify no error codes. Unit will turn on, but not able to select dryer cycle and start dryer cycle. Performed continuity checks and all passed. Issue now is the cycle selector knob will not work and LED lights around cycle selector knob will not light up. Troubleshooting leads back to either user interface control board or main control board. Any thoughts or suggestions?