What was found
LT GEAR (RED AND GREEN) INDICATOR LIGHTS ILLUMINATED IN FLIGHT. ON APPROACH WHEN LANDING GEAR LEVER PLACED DOWN, UNSAFE LIGHT REMAIN ON, RAN QRH AND CHECKED MANUAL MAIN GEAR EXTENSION DOWNLOCKS. FOUND PIN 31 IN PLUG D4658P PUSHED BACK AND LOCK BROKEN. REPLACED PLUG D4658P. COMPLETED OPS CK OF GEAR INDICATION IAW AMM 727-32-61-001-5. ALL LIGHTS CK'D GOOD. COMPLETED GEAR SWING IAW MOCC REQUEST, STILL CHECKS GOOD, ALL GEAR INDICATION LIGHTS WORK GOOD (GEAR UP, LIGHTS OUT AND GEAR DOWN LIGHTS GREEN. CLOSED- FINAL.