As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6299 - IAD-LGA - DURING TAKEOFF, UNSCHEDULED LANDING AT IAD DUE TO GEAR HANDLE WARNING LIGHT ILLUMINATED. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND REMOVED AND REPLACED LEFT MAIN LANDING GEAR MICROSWITCH. OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)