What was found
CONTROL CABIN ZONE TEMP ILLUMINATED WITH MASTER CAUTION RECALL AND DOES RESET. ACFT GROUNDED. PERFORMED A PACK TEMPERATURE CONTROL BITE PROCEDURE IAW FIM 21-62, TASK 801. RIGHT PACK/ZONE TEMPERATURE CONTROLLER LOGGED A FLT DECK TRIM VALVE FAULT FOR BITE AND PREFLT. VERIFY PASSED WITH NO FAULTS. CLEANED FLT DECK TEMP SENSOR AND REPLACED FILTER IAW AMM 21-61-10, AND AMM21-61-06. OPERATED PACKS FOR SEVERAL MINUTES AND PERFORMED BITE PROCEDURE AGAIN WITH NO FAULTS NOTED. SIGNIFICANT SYSTEM GROUND VERIFICATON SUCCESSFUL.