As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CAB ZONE TEMP ANNUN ILLUM WHEN 6-PACK PUSHED. MASTER CAUTION RESETS THE LIGHT OUT. TEMP CONTROLS NORMALLY WHEN KNOB ROTATED HOT OR COLD. GROUNDED - YES. INITIAL EVALUATION, CONT CAB ZONE TEMP ON MASTER RECALL AT OVERHEAD. PERFORMED PZTC IAW B737-800 FIM 21-62 TASK 801. #2 CONTROLLER HAD FLT DECK TRIM VALVE ON BITE, CLEARED GREEN ON VERIFY. PER FIM 21-53 TASK 821, NO FURTHER ACTION REQUIRED.