As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT AFTER TAKEOFF BOTH RADIO MANAGEMENT UNITS SHOWED DASHES IN THE TRANSPONDER AND TCAS FIELDS. THE FLIGHT RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE NR 2 INTEGRATED COMMUNICATIONS UNIT. OPS CHECKS WERE GOOD WITH NO FURTHER DEFECTS NOTED.