As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BWI - FL766 - AFTER TAKEOFF AT 11,000 FEET (300 KTS) THE AFT CARGO DOOR WARNING LIGHT WAS FLICKERING. NO PRESSURIZATION LOSS WAS NOTED. THE CREW ELECTED TO RETURN TO BWI. THE A/C LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE AFT CARGO DOOR SENSOR AND ADJUSTED THE SWITCH. OPERATIONAL CHECK GOOD. (M)