As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR CONDITIONING VALVE CIRCUIT BREAKER POPPED AFTER TAKEOFF AND WOULD NOT RESET WHICH PREVENTED THE AIRCRAFT FROM PRESSURIZING. THE PILOTS REMAINED AT LOWER ALTITUDE WHILE FOLLOWING PROPER PROCEDURES AND LANDED AT THE NEXT AIRPORT. THE PART WAS REPLACED AND THE SYSTEM CHECKED GOOD. WE ARE PRESENTLY WAITING ON A TEARDOWN REPORT OF THE UNIT. TSO 3474.5