What was found
CONTROL CABIN ZONE TEMP LIGHT ILLUMINATED ON RECALL AND WILL NOT RESET WITH TRIP RESET. AIRCRAFT GROUNDED. CONFIRMED CONTROL CABIN ZONE TEMP LIGHT ILLUMINATED ON RECALL. PERFORMED PACK/ZONE CONTROL BITE TEST IAW AMM 21-61-00. FOUND NR 2 PACK/ZONE TEMP CONTROL WITH FLIGHT DECK PRIM TEMP CONTROL VALVE FAULT LIGHT ON AFTER PRESSING PREVIOUS FLT BUTTON. CONTINUED WITH VERIFICATION PORTION OF BITE TEST. OPS NORMAL. FAULT CLEARED & DID NOT RETURN UPON SUBSEQUENT TEST. ALL FAULT LIGHTS REMAIN OUT. CONTROL CABIN ZONE TEMP LIGHT IN COCKPIT OVERHEAD REMAINS EXTINGUISHED ON MASTER RECALL. NO OTHER OCCURRENCES OF THIS DISCREPANCY LAST 30 DAYS. ETOPS SIGNIFICANT GROUND VERIFICATION SUCCESSFUL.