As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED THEY COULD NOT ACHIEVE A COMFORTABLE TEMPERATURE IN THE CABIN (UNABLE TO COOL). TROUBLESHOOTING REVEALED THE HOT AIR BYPASS VALVE DOOR HAD ROTATED ON ITS SHAFT AND WOULD NOT FULLY CLOSE. THE DOOR IS HELD ON THE SHAFT WITH 4 SET SCREWS. INSPECTION DETERMINED 2 SET SCREWS WERE MISSING, THE 3RD SCREW WAS LOOSE, AND THE 4TH SCREW COULD NOT HOLD THE DOOR TO THE SHAFT SECURELY.