As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL350 FLIGHT CREW GOT EICAS MESSAGE: 'FWD OUTFLOW VALVE'. AIRCRAFT DESCENDED DUE CLIMBING CABIN. CREW COULD NOT CONTROL CABIN PRESSURE. CAPTAIN DECLARED AN EMERGENCY AT FL240. FLIGHT CLEARED TO 10,000 FEET. DURING DESCENT, ALL OXYGEN MASKS DEPLOYED.