What was found
FLIGHT DISPATCHED SINGLE PACK MEL. AT FL320 WORKING PACK (R) PACK EICAS MESSAGES RT PACK TEMP AND RT PACK OFF APPEARED. RAN QRH WHILE EXECUTING DESCENT TO 10000 FT. RETURNED TO MEM UNPRESSURIZED. AMM: 21-51-19-2 , FIM: 21-51 FT844, REMOVED AND REPLACED COMPRESSOR OUTLET OVERHEAT SWITCH S556. LEAK CHECK GOOD. RT PACK WENT INOPERATIVE DURING OPS CHECK PERFORMED BITE TEST OF RT PACK TEMPERATURE CONTROLLER FOUND COMPRESSOR OUTLET TEMPERATURE SENSOR FAULT TS42. RT PACK OPS CHKD GOOD IN STANBY MODE. STILL REQUIRES MORE TROUBLESHOOTING. AMM: 21-51-06-4, REMOVED AND REPLACED RT PACK AUTOMATIC COMPRESSOR DISCHARGE TEMPERATURE SENSOR PER ABOVE AMM. REQUIRES OPS AND LEAK CHECK.