What was found
PACK LIGHT WILL NOT RESET, LIGHT STAYS ON. ACFT GROUNDED. VERIFIED THAT LIGHT WOULD NOT RESET WITH MASTER CAUTION RECALL RESET. T RIED 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 TEST OK AND PACKS OPS CHECK OK. TEMPS CONTROLLABLE EACH ZONE.