As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, THE CREW REPORTED THAT THE RMU NR 1 COMMUNICATION FREQUENCIES WOULD NOT HOLD; THAT IT KEPT REVERTING BACK TO THE OLD FREQUENCY. MAINTENANCE REMOVED AND REPLACED THE NR 2 RMU AND PERFORMED AN OPERATIONAL CHECK OF THE COMMUNICATIONS SYSTEM. OPS CHECKED GOOD.