As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNABLE TO CONTROL FLT DECK TEMP USING CONTROL CABIN TEMP SELECT. ACFT GROUNDED. CLEANED CONTROL CABIN TEMP SENSOR & REPLACED FILTER. OPERATED PACKS. VERIFIED CONTROL CABIN DUCT TEMP, RESPONDS TO TEMP SELECTOR NORMALLY. BITE CHECK OF BOTH TEMP CONTROLLERS IAW MM 21-61-00, SHOWS NO FAULTS. HAS NO OTHER RECENT HISTORY.