As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TEMP SUPPLY DUCT SWITCH DOES NOT READ CORRECTLY WHEN SWITCH IS IN AFT POSITION. TEMP GAGE VARIES BETWEEN 20-40 DEGREES C. ACFT GROUNDED. REPLACED FILTER AND CLEANED TEMP SENSOR, ACCOMPLISH BITE ON BOTH ZONE TEMP CONTROLLERS NO FAULTS REF AMM 21-61-00.