What was found
(CAN) ON A FLIGHT, UPON ENTERING THE CONTROL ZONE, THE PILOT HAD NO JOY CONTACTING FSS ON COMM NR 2. THE PILOT SELECTED COMM NR 1 AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE DISCOVERED THE PILOT, PUSH TO TALK, BUTTON WAS UNSERVICEABLE, THE SWITCH WAS REPLACED WITH NEW.