As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER PUSH AND ENGINE START, AFT CAB TEMP RAN AWAY HIGH. ON MASTER CAUTION RECALL, AFT ZONE TEMP LIGHT ILLUMINATED. TRIM AIR NEEDED TO BE TURNED OFF TO CONTROL AFT ZONE TEMP. ACFT GROUNDED. BITE CHECKED ZONE TEMP CONTROLLERS REF FIM 21-62, TASK 801, NR 1 CONTROLLER FAULTS AFT CABIN TRIM VALVE. AFT CABIN TEMP STILL UNCONTROLLABLE WITH TRIM AIR OFF. R & R AFT ZONE TRIM AIR MODULATING VALVE REF AMM 21-61-21. OPS AND LEAK CHECKS GOOD.