As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6590 - IAD-RDU - DURING TAXI, EXPERIENCED A FAILURE OF THE NR 1 RMU SCREEN. SCREEN WENT BLANK. AIRCRAFT RETURNED TO GATE. MAINTENANCE REMOVED AND REPLACED NR 1 RADIO MANAGEMENT UNIT AND PERFORMED FUNCTIONAL CHECK OF THE SYSTEM. FUNCTIONAL CHECK PROVED GOOD. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)