As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 5531 - IAD-ORF - MADE AN UNSCHEDULED LANDING DUE TO RED GEAR HANDLE LIGHT REMAINED ILLUMINATED WITH GEAR UP. AIRCRAFT RETURNED TO GATE WITH NO FURTHER INCIDENTS. MAINTENANCE REMOVED AND REPLACED RIGHT UPLOCK MICROSWITCH. OPS CHECK AND GEAR SWING OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)