What was found
FLT 010 - KDAY-KSJC - ON CLIMB-OUT PASSING FL 240 NR 3 ENGINE FIRE LIGHT ILLUMINATED AND FIRE BELL SOUNDED. NR 3 PNEUMATIC SWITCH WAS TURNED OFF WITH NO CHANGE. ALL OTHER INDICATIONS NORMAL. SHUT ENGINE DOWN PER ENGINE FIRE CHECK LIST. LIGHT AND BELL WENT OUT WHEN FUEL LEVER WAS SHUT OFF. KSJC MX CHECKED ENGINE AIR, FUEL, AND HYDRAULICS FOR LEAKS DURING GROUND RUN. NONE NOTED. CLEANED FIRE LOOP CONNECTORS AND FOUND UPPER LOOP CONNECTOR GROUND WIRE OFF GROUNDING STUD. REPLACED CONNECTOR ON GROUND AN RECONNECTED GROUND WIRE. NR 3 ENGNE CHECKS NORMAL, OK FOR SERVICE.