What was found
REROUTED TO DFW WITH GEAR DOWN AT 265 KT SW IND LEFT MAIN GEAR WOULD NOT RETRACT. WITH GEAR HANDLE IN UP POSITION - ALL LIGHTS OUT, WITH HANDLE IN OFF POSITION GREEN LIGHT ILLUM. RECYCLED GEAR, SAME IND AT 205 KNOTS IND. REMOVED GEAR PIN FROM LEFT MAIN GEAR FWD OVERCENTER LINK OK TO CONTINUE AIRSPEED UNDER 270 REF AMM 05-51-07-2 AND A/C AOM.