As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FWD CABIN AT 1 O'CLOCK, AFT CABIN AT 3 O'CLOCK TO MAINTAIN NORMAL CABIN TEMPERATURE RANGE. ACFT GROUNDED. FOUND FWD & AFT ZONE TEMP SENSOR FILTER CLOGGED. REMOVED AND REPLACED FWD & AFT ZONE TEMP SENSOR FILTER, IAW AMM 21-61-00, OPS CHECK NORMAL. FWD/AFT CABIN TEMPERATURES & DUCT TEMPERATURES ARE THE SAME (MATCHING) AT DIFFERENT TEMP SETTINGS.