As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 1919 DIVERTED TO GRB FOR LOSS OF PRESSURIZATION. BOTH PACKS WERE INOPERATIVE. CREW BEGAN RAPID DESCENT AND ALL MASKS DEPLOYED. MAINTENANCE FOUND THE LEFT PACK INOPERATIVE. THE LEFT PRSOV WAS REPLACED PER THE AMM. LEFT AND RIGHT PACKS CHECKED OKAY.