As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CAB ZONE TEMP ILLUMINATED AND CLEARS ON MASTER RECALL. GROUNDED - YES. PERFORMED PACK/ZONE TEMP CONTROLLER BITE TEST IAW B737-800 AMM 21-61-00-700-806-002. RIGHT PACK ZONE TEMP CONTROLLER (2) SHOWED FLT DECK TRIM VALVE FAULT. FAULT CLEARED AND IS NO LONGER ACTIVE. CABIN TEMP CONTROL AND INDICATION OPERATIONAL TEST PASS IAW AMM 21-61-00-700-807-002. GROUND VERIFICATION SUCCESSFUL.