As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT NUMBER 533. DURING CRUISE, LT PACK OFF AND PACK TEMP DISPLAYED (EICAS) INOP & PACK OFF LIGHT ILLUMINATED. LIGHT RE-ILLUMINATED AFTER PACK RESET IN STANDBY. MAINTENANCE REMOVED AND REPLACED COMPRESSOR OUTLET SENSOR TS41 IN ACCORDANCE WITH M.M. 21-51-11. PERFORMED OPS CHECK, PACK CHECKS NORMAL IN STANDBY MODE. OPERATIONAL CHECK IN AUTO MODE FAILS. REF 2150/859 LOGPAGE 519724 ITEM 4 FOR NEW DISCREPANCY.