As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR INFLIGHT LGA-ORD. CREW REPORTED DURING CLIMB OUT PRESSURIZATION WAS LOST FOLLOWED BY O2 MASKS DEPLOYMENT. EMERGENCY DECLARED FLIGHT DIVERTED EWR LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED NR 1 CABIN PRESSURE CONTROLLER & PRESSURE SELECTOR. SYSTEM GROUND CHECKED NORMAL OPERATION CLOSED.