What was found
CONTROL CABIN ZONE TEMP LIGHT ILLUMINATES ON RECALL, RESETS WITH MASTER CAUTION RESET. ACFT GROUNDED. VERIFIED CONTROL CABIN ZONE TEMP ANNUNCIATOR ILLUMINATOR ON RECALL. PERFORMED PACK/ZONE TEMP CONTROLLER BITE TEST FOUND FLT DECK TRIM VALVE FAULT LT ON NR 2 CONTROLLER. COMPLETED BITE TEST IAW AMM 21-61-00 BITE TEST SUCCESSFUL & FAULT LT CLEARED. CONTROLLER CABIN ZONE TEMP ANNUNCIATOR REMAINS EXTINGUISHED ON RECALL. CHECKED HISTORY, NO OCCURRENCES FOR THIS PROBLEM LAST 90 DAYS. GROUND VERIFICATION SUCCESSFUL.