What was found
AFTER TAKEOFF, KRUEGER FLAP FAILED TO RETRACT. CREW REPORTED A "CONFIG" LIGHT ON MWP. ALSO, FLIGHT CHARACTERISTICS OF AIRCRAFT SEEMED DIFFERENT. DECISION MADE TO RETURN TO AIRFIELD. AIRCRAFT LANDED NORMAL, NO FUEL WAS DUMPED. MAINTENANCE UPON TROUBLESHOOTING FOUND LOOSE GROUND WIRE TERMINAL AT RIGHT KRUEGER FLAP POSITION SENSOR. TERMINAL WIRE RE-SECURED. OPERATIONAL CHECK COMPLIED WITH, NO DEFECTS NOTED IAW 27-85-00. AIRCRAFT RETURNED TO SERVICE.