As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER THE REPLACEMENT OF THE NR 1 AIR CONDITIONING PACK CONTROL VALVE WITH A REPAIRED VALVE, DURING THE OPS CHECK OF THE VALVE, IT CAUSED THE CIRCUIT BREAKER TO OPEN, FAILING THE TEST. A REVIEW OF THE TEARDOWN REPORT INDICATED THAT THE VALVE REPAIR WAS REQUIRED BECAUSE IT POPPED THE CIRCUIT BREAKER. AFTER INSTALLING A NEW VALVE THE SYSTEM WORKED NORMALLY WITHOUT POPPING THE CIRCUIT BREAKER. THE TOTAL TIME AND CYCLES ON THE REPAIRED VALVE WERE NOT REPORTED.