As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 6418 - IAD-BOS - DURING CRUISE, MADE AN UNSCHEDULED LANDING DUE TO RADAR INOP, WEATHER WOULD NOT PERMIT AIRCRAFT TO CONTINUE TO BOS. AIRCRAFT RETURNED TO GATE WITH NO FURTHER INCIDENTS. MAINTENANCE REMOVED AND REPLACED RADAR RIGHT. OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)