As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FWD CABIN ZONE TEMP LIGHT ILLUMINATED ON PUSHING MASTER CAUTION RECALL BUTTON, LIGHT EXTINGUISHED WHEN PRESSING MASTER CAUTION RESET BUTTON. ACFT GROUNDED. WHILE ON DEFERRAL, UNABLE TO MAKE FWD/AFT CABIN CONTROL ADJUST TEMP. R & R THE FWD TRIM MODULATING VALVE REF AMM 21-51-10. INSPECTED CABIN SENSORS, R & R ALL FILTERS AS WELL. AS CLEANED, BOTH FWD & AFT GALLEY VENTILATION GRILLS.