As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ZONE TEMP CONT CAB , CANCELS ON RECALL. GROUNDED - YES. PACK/ZONE TEMPERATURE CONTROLLER BITE PER B737-800 FIM 21-62 TASK 801 SHOWED FLIGHT DECK TEMP CONTROL VALVE FAULT BUT VERIFY TEST DID NOT CONFIRM FAULT. CLEANED FLIGHT DECK TEMP SENSOR AND FILTER AND PERFORMED CABIN TEMP CONTROL AND INDICATION OPERATIONAL TEST PER B737-800 AMM 21-61-00-700-807-002 - ALL TESTS PASS.