What was found
PHL - FLT 1043 - AFTER TAKEOFF, CREW WAS UNABLE TO PRESSURIZE CABIN DUE TO THE FORWARD ENTRY DOOR NOT SEALING PROPERLY. FLIGHT RETURNED TO FIELD AT PHL AND LANDED WITHOUT FURTHER INCIDENT. NO EMERGENCY WAS DECLARED. MAINTENANCE FOUND THE FORWARD ENTRY DOOR NOT CLOSED PROPERLY. INSPECTED DOOR OPERATION, DOOR WARNING LIGHT SYSTEM AND DOOR SEAL. NO DEFECTS NOTED. CLOSED DOOR CORRECTLY. AIRCRAFT OK FOR SERVICE. (M)