As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIFFICULT AND CONSTANTLY ADJUSTING TEMPERATURE CONTROLS TO MAINTAIN COMFORTABLE TEMPERATURE IN FLIGHT DECK, FWD, AND AFT CABIN. NOT NORMAL INDIVIDUAL TEMP SELECTIONS. ACFT GROUNDED. BITE CHECK OF ZONE TEMP CONTROLLERS SHOW NO FAULTS. FOUND CABIN TEMP SENSORS TO HAVE FILTER SCREENS TO BE COMPLETELY CLOGGED. CLEANED THE FILTERS AND SYSTEM OPS NORMAL IAW AMM 21-61-10.