As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 6405 - IAD-HPN - DURING CLIMB, RETURNED TO IAD DUE TO WX RADAR FAILED IN FLIGHT. AIRCRAFT RETURNED TO GATE AT IAS WITH NO FURTHER INCIDENTS. MAINTENANCE REMOVED AND REPLACED RADAR R/T. OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)