As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED A GPWS WARNING DURING LOW ALTITUDE FLIGHT. ALL WARNING ILLUMINATED AFTER TAKE-OFF AND ON APPROACH TO LANDING. THE MAINTENANCE VENDOR TROUBLESHOT AND REPLACED THE RIGHT RADIO ALT UNIT WITH A TESTED STATUS UNIT. OPS CHECKS WERE SATISFACTORY AND THE AIRCRAFT WAS RETURNED TO SERVICE.