What was found
DURING RECALL, AFT CABIN ZONE LIGHT ILLUMINATED. RESETS WITH MASTER CAUTION RESET. ACFT GROUNDED. PERFORMED PACK/ZONE TEMPERATURE CONTROLLER BITE TEST REF MM21-51-00. FOUND STANDBY PACK CONTROLLER FAULT LOGGED ON NR 2 TEMP CONTROLLER. RESET FAULT AND OPERATED BOTH PACKS FOR 20 MIN +. RECHECKED NR 2 TEMP. CONTROLLER FOR FAULTS, PERFORMED PACK/ZONE TEMP CONTROLLER BITE SEVERAL TIMES. OPS NORMAL. NO FAULTS NOTED. ALSO FOUND AFT CABIN TEMP SENSOR FILTER DIRTY. REPLACED FILTER REF MM21-61-06.