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 TRANSPONDERS 1 AND 2 WERE INOP WITH NO TCAS INFORMATION. ATC RECEIVERS HAD PRIMARY RADAR TARGET ONLY AND NO ALTITUDE INFORMATION. THE AIRCRAFT RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE NR 2 COMMUNICATIONS UNIT WITH NO FURTHER DEFECTS NOTED.