As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN TEMP CONTROL WORKS ERRATICALLY. COCKPIT TEMP IS STILL TOO COOL EVEN WITH TEMP CONTROL FULL HOT. ACFT GROUNDED. FOUND TEMP SENSOR FILTER VERY DIRTY. CLEANED ALL TEMP SENSOR FILTERS REF MM 21-61-06. TESTS OK. SUCCESSFUL GROUND VERIFICATION COMPLETED.