As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. AIR INTERRUPT, EMERGENCY NOT DECLARED. LANDING UNEVENTFUL. ACFT NOT OVERWEIGHT. DURING CRUISE THE FLIGHT DECK TEMPERATURE INCREASED AND BECAME UNCONTROLLABLE. MAINTENANCE R & R THE TRIM AIR PRESSURE REGULATING AND SHUTOFF VALVE IAW AMM 21-62-01. OPS CHECK NORMAL.