As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
"CONT CAB" LIGHT CAME ON AFTER ENGINE, RAN ASA QRH, LIGHT RESETS WITH MASTER CAUTION. GROUNDED - YES. PERFORMED PACK/ZONE TEMP CONTROLLER BITE TEST REF B737-900 AMM 21-61-00-700-806-002. #2 CONTROLLER FLT DECK TRIM VALVE FAULTED PREVIOUS LEG. PERFORMED INITIAL INSPECTION. ACCOMPLISHED PACK/ ZONE TEMPERATURE CONTROLLER BITE TEST ON SYSTEM #1 AND #2. NO FAULTS FOUND AT THIS TIME. INTERMITTENT FAULT SUSPECTED. REF B737-900 AMM 21-61-00 FOR BITE TEST.