As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 3064 - RIC - FLIGHT CREW REPORTED THAT NAV NR 1 AND NAV NR 2 DASHED OUT - NO NAV INFLIGHT. CREW DIVERTED FLIGHT TO RIC AND LANDED ACFT UNEVENTFUL. RIC MX REMOVED AND REPLACED NR 1 AUDIO CONTROL UNIT AND PERFORMED OPERATIONAL CHECK SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE.