Samsung NX58H9950WS - was doing a self-cleaning cycle when the front panel went dead. Door is locked. Powered down at circuit breaker, waited 15 minutes, powered up - did not help. Burners (gas) work. Is it possible to diagnose main control and/or high limit thermostat issues and fix without pulling unit out and removing back panel? Do we have to remove the back panel in order to release the door if the electronic components are replaced? Thank you!