What was found
NR 2 ENGINE FIRE WARNING AND LIGHTS ON, FIRE T-HANDLE ILLUMINATED IN FLIGHT. EMERGENCY CHECKLIST FOLLOWED AND SINGLE ENGINE LANDING PERFORMED. INVESTIGATION REVEALED NO EVIDENCE OF FIRE, AND THE FIRE WARNING REMAINED ILLUMINATED WITH AIRCRAFT ON THE GROUND AND ENGINES NOT RUNNING. TROUBLESHOOTING BY MAINTENENACE TECHNICIANS FOUND CORRSOSION IN CONNECTOR PLUG J314 (LOCATED IN THE BAGGAGE COMPARTMENT UPPER RT CORNER). CONNECTOR PLUG WAS REPAIRED, FIRE DETECTION SYSTEM OPS CHECKED OK.