What was found
DURING EN ROUTE CLIMB AT APPROXIMATELY FL200, THE CREW RECEIVED MASTER WARNING INDICATION FOR FUSELAGE DOORS/FWD CARGO. CREW LEVELED THE AIRCRAFT AND RAN QRH. VERIFIED PRESSURIZATION WAS HOLDING AND ANNOUNCED INTENTIONS TO ATC TO DIVERT TO DAL. FUSELAGE DOORS/FWD CARGO INDICATION EXTINGUISHED AFTER APPROXIMATELY 4 MINUTES AND DID NOT ILLUMINATE AGAIN DURING FLIGHT. FLIGHT LANDED IN DAL WITHOUT FURTHER INCIDENT. FOUND PROX SWITCH ON FWD CARGO DOOR FRAME PLUG TO BE LOOSE. RE-TIGHTENED CONNECTOR. ALSO LUBED ALL TRACK GUIDES, ROLLERS. OPS CHECKED GOOD.