What was found
AT GATE RETURN FLIGHT CREW REPORTED BURNING ODOR SMELL IN CABIN. FOUND 3 STATUS MESSAGES REF LP 8941702, 8941648 AND 8941641. RT PACK WOULD NOT TURN ON. PRESSED PACK RESET SWITCH WHICH CLEARED THE MESSAGES THEN CYCLED PACK SWITCH ON. WITHIN 1 MIN OF PACK RUNNING HEAVY ODOR SULFUR ODOR FILLED CABIN & FLT DECK THEN RT PACK SWITCHED CYCLED OFF & ODOR DISSIPATED. CYCLED LT PACK SWITCH ON FOR AT LEAST 10 MINS UNTIL ACFT DEBOARDED & NO FURTHER ODOR NOTED. UPDATING FAULT CODES 21-65223,21-65173, REF FIM DMC-B787-A-21-50-F2-71A-421A-A PERFORMED RT ACM BREAKAWAY TORQUE FUNCTIONAL TEST IAW AMM DMC-B787-A-21-52-02-00A-340A-A. BREAKAWAY TORQUE OUT OF RANGE & FOUND EVIDENCE OF ACM OUTLET TURBINE SCRAPING HOUSING. LP 8944726 CREATED FOR REPLCEMENT OF RH ACM. REF LP 8944726 REPLACED RH ACM. CABIN AIR CONDITIONING/TEMP CONTROL SYSTEM RIGHT PACK AIR OFF AND RIGHT PACK AIR ON TESTS PASSED. OPRATED RT PACK FOR 1 HR, NO UNUSUAL ODOR AND NO MX MESSAGES. BOTH LT & RT PACKS OPERATE NORMALLY. REMOVED RT ACM IAW AMM DMC-B787-A-21-52-02-02A-520A-A.