As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 6200 - IAD-ROA - DURING CRUISE, RETURNED TO IAD DUE TO BOTH NAVIGATION RADIOS WERE INTERMITTENT. AIRCRAFT LANDED AT IAD WITH NO FURTHER INCIDENTS. MAINTENANCE REPLACED BOTH NAVIGATION RECEIVERS. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)