What was found
FLT 627 - PIT - AVP - AFTER TAKEOFF FROM PIT WHEN LANDING GEAR WAS RETRACTED, A GROUND/FLT FAULT, LIFT DUMPER FAULT, AND TCAS FAULT ILLUMINATED ON THE MULTIFUNCTION DISPLAY. THE AIRCRAFT RETURNED TO PIT AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE NR 3 GROUND/FLT SENSOR LOCATED ON THE LEFT MAIN LANDING GEAR AND PERFORMED A SATISFACTORY GEAR SWING. (M)