As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6599 - IAD-EWR - DURING CLIMB-OUT, DECLARED AN EMERGENCY AND RETURNED TO IAD DUE TO THE MAIN PASSENGER DOOR WARNING LIGHT ILLUMINATING AND AIRCRAFT NOT PRESSURIZING. AIRCRAFT LANDED WITH NO FURTHER INCIDENTS. MX OPENED DMI NR 08051 IAW MEL 53-3. MX LATER CLEARED DMI NR 08051 ON BY RESETTING THE DOOR WARNING RESET SWITCH. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)