As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN ALTITUDE EICAS MSG AT FL300. IN ADDITION TO CABIN ALTITUDE FAULT. RT PACK FLOW CONTROL AND SHUTOFF VALVE WAS REMOVED AND REPLACED. OPERATIONAL TESTED BOTH LEFT AND RIGHT PACKS. MOVED PACK TEMPERATURE CONTROLS TO LOW AND HIGH SETTINGS. SYSTEM OPERATIONALLY TEST FUNCTIONAL. NO DISCREPANCIES NOTED. REVERSED DMP. OK TO CONTINUE SERVICE.