As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ZONE TEMP CONT CAB INOP. GROUNDED - YES. PERFORMED PACK /ZONE TEMPERATURE CONTROLLER BITE TEST REF B737-900 AMM 21-61-00. PACK CONTROLLER 2 FLAGGED FLIGHT DECK TRIM VALVE ON "BIT" AND " PREV FLT" VERIFY ON BOTH BOXES SHOW GREEN. PER B737-900 FIM 21-62 TASK 832, NO FAULT PRESENT. DUE TO HISTORY, REQUIRES REPLACEMENT OF FLIGHT DECK TRIM VALVE. REPLACED CONT CAB TRIM MODULATING VALVE REF AMM 21-51-10 OPS CHECK GOOD. NO FAULTS FOUND.