What was found
DURING CRUISE APPROXIMATELY 13,000 FT CREW RECEIVED MASTER WARNING FOR FUSELAGE DOORS / FWD CARGO DOOR. CREW RAN QRH. PRESSURIZATION WAS NORMAL, BUT DUE TO CREW UNABLE TO VISUALLY CONFIRM FWD CARGO DOOR SECURITY, INITIATED DIVERSION TO BWI. LIGHT EXTINGUISHED ON FINAL APPROACH. FLIGHT LANDED WITHOUT FURTHER INCIDENT. INSPECTED AND FOUND TO BE BAD CONNECTION IN FWD CARGO DOOR HANDLE PROX SENSOR CONNECTOR, MEL'D FWD CARGO DOOR PROX SENSOR, AND PLACED AUTO MODE PRESSURIZATION ON MEL. LATER REPAIRED FWD CARGO DOOR HANDLE PROX SENSOR CONNECTOR.