What was found
IAD/CHS - FLT 7567 - DURING CLIMB, AIRCRAFT MADE AN UNSCHEDULED LANDING DUE TO RED GEAR WARNING LIGHT ILLUMINATED IN GEAR HANDLE. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND REMOVED AND REPLACED LEFT MAIN GEAR STANDBY UPLOCK MICROSWITCH. MAINTENANCE PERFORMED GEAR SWINGS. OPS CHECK OK. AIRCRAFT RELEASED AND APPROVED FOR RETURN TO SERVICE. (X)