As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CAB ZONE TEMP MASTER CAUTION LIGHT ON RECALL. GROUNDED - YES. PERFORMED PZTC BITE IAW B737-800 FIM 21-62 TASK 801. FLT DECK TRIM VALVE RED LIGHT ON BIT, CLEARED GREEN ON VERIFY. NO FAULTS REMAIN ON MASTER RECALL. CLEANED FLT DECK SENSOR IAW B737-800 AMM 21-61-10-100-801. RAN BOTH PACKS UP IAW AMM 21-61-00-700-807-002 FOR 15-20 MINS, NO FAULTS OR LIGHTS ILLUMINATED.