As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONTROL CABIN ZONE TEMP LIGHT ILLUMINATED BUT GOES OUT WITH RECALL. QRH ACCOMPLISHED. GROUNDED - YES. RELEASED PER MEL 21-21G PRIMARY FLT DECK TEMP CONTROL INOP. ACCOMPLISHED PACK TEMP CONTROLLER BITE REF B737-900 FIM 21-61 TASK 801. LAST LEG SHOWS CONT CABIN TRIM VALVE FAULT ON #2 CONTROLLER. ACCOMPLISHED VERIFY TEST, NO FAULTS FOUND. RESET FAULT REF SAME, OPS NORMAL. CLEARS MEL 21-21G.