As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FWD AND AFT TEMP CONTROL OUTPUT VERY WARM INDICATED 22DEG REDUCE TEMP TO 8DEG FELT NORMAL TEMP DOES NOT CORRESPOND WITH INDICATION. GROUNDED - YES. ACCOMPLISHED BITE ON BOTH TEMP CONTROLLERS, NO FAULTS FOUND. FOUND BOTH FWD & AFT CABIN TEMP SENSOR FILTERS DIRTY & CLOGGED. CLEANED BOTH FILTERS REF AMM 21-61-06-100-801 OPERATED PACKS & ZONE TEMPS MATCH INDICATION IN FLIGHT DECK.