What was found
AFTER T/O AND AFTER GEAR RETRACTION, LT MAIN GEAR RED LIGHT STAYED ON, RECYCLED GEAR DID NOT SOLVE PROBLEM AC RETURNED WITHOUT INCIDENT. T/S SYSTEM REPLACED LANDING GEAR ACCY. PERFORMED GEAR SWING IAW MM AND LANDING GEAR ACCY UNIT IAW MM. SYSTEM CHECKS GOOD, AC RETURNED TO SERVICE WITHOUT INCIDENT.