As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CABIN ZONE TEMP INOP (LIGHT ILLUMINATES ON RECALL. RESETS OFF WITH MC RESET). GROUNDED - YES. PERFORMED TEMP CONT BITE TEST REF B737-900 AMM 21-61-00-700-806-002 CONTLR 2 REPORTED FAULT ON TRIM VALVE ON PREV FLIGHT. PERFORMED VERIFY OP'S CHECK, FAULT CLEARED. VERIFIED 2ND BITE, NO FAULTS NOTED.