As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT.CAB ZONE TEMP LIGHT COMES ON DURING MASTER CAUTION RECALL. GROUNDED - YES. ON CONT #2 FAULTED FLT DECK TRIM VLVE ON BIT AND PREV. FLT. FOUND FLIGHT DECK TEMP SENSOR DIRTY. CLEANED TEMP SENSOR REF B737-800 AMM 21-61-10. PERFORMED PZTC BITE AGAIN. NO FAULTS. OPERATED BOTH PACKS, STILL NO FAULTS.