What was found
CONTROL CABIN ZONE TEMP ILLUMINATED ON RECALL. ACFT GROUNDED. ACCOMPLISHED PACK/ZONE TEMPERATURE CONTROLLER BITE TEST IAW AMM 21-61-00-700-806-002. LEFT CONTROLLER SHOWED TCV FAULT IN FLT HISTORY. UPON BITE VERIFICATION, THE CONTROLLER RESET WITH NO FURTHER OCCURRENCES. ACCOMPLISHED CABIN TEMPERATURE CONTROL AND INDICATION OPERATIONAL TEST IAW AMM 21-61-00-700-807-002. CABIN TEMP RESPONDED TO FULL RANGE WITH NO FAULTS NOTED. RECALL NO LONGER ILLUMINATES A FAULT. GROUND VERIFICATION SUCCESSFUL FOR ZONE TEMPS.