As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRIMARY TEMP ILLUMINATES ON RECALL/ RESETS W/ M/C. GROUNDED - YES. PERFORMED PZTC BITE REF B737-800 AMM 21-61-00. ON CONTROLLER 2 FLIGHT DECK TRIM VALVE FAULTED ON BIT AND PREV FLT. PUSHED VERIFY AND GREEN GO LIGHT ILLUMINATED. PERFORMED CLEANING OF FLIGHT COMPARTMENT TEMP SENSOR REF AMM 21-61-10. OPERATED PACKS FOR 10 MINUTES AND PERFORMED PZTC AGAIN. NO FAULTS FOUND.