As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MASTER CAUTION RECALL, RECEIVED AIR CONDITIONER MASTER CAUTION ASSOCIATED WITH AFT CAB ZONE TEMP AMBER LIGHT. ACFT GROUNDED. PERFORMED PACK TEMP CONTROL BITE PROCEDURE IAW FIM 21-62, TASK 801, BOTH CONTROLLERS CK GOOD. CLEANED AFT CABIN TEMP SENSOR FILTER IAW AMM 21-61-06-100-801, AFT CABIN TEMP SELECTION OPERATES NORMALLY. RECALL NO LONGER ILLUMINATES AFT CABIN ZONE TEMP LIGHT.