As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT ALTITUDE CABIN AND COCKPIT TEMP STEADILY ROSE TO 34 DEG. IN COCKPIT AND 29 DEG IN THE CABIN.THE AIR THROUGH THE VENTS WAS VERY HOT. COCKPIT AND CABIN TEMP CONTROLLERS WERE BOTH SET TO FULL COLD 18 DEG. T/S PER FIM TASK 21-51-00-810-A NR 2 PACK BYPASS VLV FAULTING. SWAPPED NR 1 & 2 BYPASS VALVES. FAULT FOLLOWED SWAPPED NR 1 & 2 VALVES BACK. R & R NR 2 PACK BYPASS VALVE PER 21-51-10-04 CK GOOD. VALVES SWAPPED PER 21-51-10-04.