What was found
AT FL350 WITH RT PACK ON GOT CABIN ALT EICAS MSG. TURNED LT PACK ON AND DID EMER DESCENT AND DIVERTED TO MEM. RT PACK TESTED GOOD. LT PACK VALVE INDICATION ON PREVIOUS DEFERRAL. REPLACED VALVE.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AT FL350 WITH RT PACK ON GOT CABIN ALT EICAS MSG. TURNED LT PACK ON AND DID EMER DESCENT AND DIVERTED TO MEM. RT PACK TESTED GOOD. LT PACK VALVE INDICATION ON PREVIOUS DEFERRAL. REPLACED VALVE.