What was found
AFTER TAKEOFF, ON GEAR RETRACTION, ALL GEAR REMAINED DOWN. ALL THREE GREEN, RED AND HANDLE LIGHTS REMAINED ILLUMINATED IAW CHECKLIST, SELECTED GEAR DOWN THEN HAD 3 GREEN AND 3 AMBER, GEAR DOORS INDICATED CLOSED 5 MINUTES LATER. JACKED ACFT, CYCLED GEAR SEVERAL TIMES. AFTER SEVERAL CYCLES, GEAR FAILED TO EXTEND. FOUND GROUND WIRE FOR SELECTOR VALVE BROKEN AT CONNECTOR PLUG. RESOLDERED WIRE TO CONNECTOR PLUG. SWUNG GEAR SEVERAL TIMES. OPS CHECKED GOOD. OK FOR SERVICE AT THIS TIME.