As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DOOR WARNING LIGHT WOULD NOT EXTINGUISH. THE DOOR WAS VERIFIED AS PINNED AND THE ITEM WAS DEFERRED. ON TAKE-OFF, THE DOOR SEAL SQUEALED EXCESSIVELY AND THE AIRCRAFT WOULD NOT PRESSURIZE. AIRCRAFT RETURNED TO THE DEPARTURE AIRPORT. SUBSEQUENT MAINTENANCE FOUND THE AFT DOOR PIN WAS MISSALIGNED AND HAD BROKEN THE DOOR LIGHT ACTUATING SWITCH. THE SWITCH WAS REPLACED AND THE DOOR RE-RIGGED. AIRCRAFT RETURNED TO SERVICE