What was found
LEFT 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 CONNECTOR D4658P PUSHED BACK AND LOCK BROKEN. REPLACED CONNECTOR D4658P, REF WDM 32-64-01 AND ALSO WDM 27-22-01. COMPLETED OPS CHECK OF GEAR INDICATION PER REF AMM 727-32-61-001-5. ALL LIGHTS CHECKED GOOD. COMPLETED GEAR SWING PER MOCC REQUEST, STILL CHECKS GOOD, ALL GEAR INDICATION LIGHTS WORK GOOD, GEAR UP LIGHTS OUT AND GEAR DOWN LIGHTS GREEN.