As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 6433 - IAD-EWR - DURING CLIMB-OUT, RETURNED TO IAD DUE TO THE RED GEAR HANDLE LIGHT REMAINING ILLUMINATED AFTER GEAR SELECTED UP. AIRCRAFT LANDED AT IAD WITH NO FURTHER INCIDENT. MX REPLACED RIGHT MAIN LANDING GAR UPLOCK SWITCH. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)