What was found
AFTER TAKEOFF CYCLED GEAR UP, LEFT MAIN GEAR DOOR AMBER LIGHT ILLUMINATED (DOORS REMAINED OPEN). LANDING GEAR INOP CAUTION LIGHT ILLUMINATED, PERFORMED ALT EXTENSION PROCEDURES. INSPECTED LT MAIN GEAR PROX SENSORS FOR DEFECTS AND PROPER GAPS, GEAR AND GEAR DOOR SENSORS CHECK GOOD IAW MM 32-10-00. JACKED A/C, SWUNG GEAR SEVERAL TIMES, NO DEFECTS NOTED. REMOVED AND REPLACED PSEU AS PRECAUTIONARY, OPS CHECK GOOD.