What was found
FLIGHT 8675 ENROUTE PDX-LMT, DURING FLIGHT, THE PILOT EXPERIENCED A STUCK MIC AND LOST RADIO COMMUNICATION. SHOWS TX ON BOTH GNS530 AND GNS430. THE PILOT FOLLOWED LOST COMM PROCEDURES AND LANDED SAFELY AT LMT. ATC DECLARED AN EMERGENCY AND EMERGENCY SERVICES MET THE AIRCRAFT UPON LANDING. MAINTENANCE TROUBLESHOT, WAS ABLE TO FREE THE STUCK PUSH TO TALK BUTTON AND DEFER THIS ISSUE. THE DEFERRAL WAS CLEARED BY REPLACING THE PUSH TO TALK SWITCH.