What was found
RIGHT PACK LIGHT ILLUMINATED ON RECALL. ACFT GROUNDED. VERIFIED THAT LIGHT WOULD NOT RESET WITH MASTER CAUTION RECALL THE LIGHT RESET. TRIED PACK RESET, NO HELP. DURING RT P/Z TEMP CONTROL TEST TCV THIS PACK FAULTED. FAULT WOULD NOT INITIALLY RESET. RESET AND RETESTED TWICE LIGHT REMAINED OUT. RAN THE RT PACK AND FWD & AFT ZONE SUPPLY TEMPS WOULD NOT CHANGE, SELECTORS POSITIONED WARM AND COLDER . REMOVED AND REPLACED THE RT PACK TCV AND P/Z TEMP CONTROLLER. SYS CHECKED OK IAW AMM 21-51-10, PB 400, AND 21-61-20, PB 400. BITE TESTED OK, AND PACKS OPS CHECKED OK. TEMPS CONTROLLABLE EACH ZONE.