As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CAB ZONE TEMP LIGHT COMES ON WITH RECALL AND RESETS WITH MASTER CAUTION. GROUNDED - YES. PERFORMED PACK/ZONE TEMP CONTROLLER BITE TEST B737-AMM 21-61-00-700-802-002 FOUND FLT DECK TRIM VALVE. REMOVED AND REPLACED FLT DECK TRIM AIR MODULATING VALVE AS REQUIRED. OPS CKD AND LEAK CKD GOOD REF AMM 21-61-21-400-801. REACCOMPLISHED BITE TEST NO FAULTS FOUND.