As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT DURING FLIGHT, BOTH LOCALIZERS BECAME ERRATIC, CLOSED THE AIRCRAFT GOT TO THE STATION. THE CREW DIVERTED AND LANDED WITHOUT INCIDENT. MAINTENANCE RE-RACKED BOTH NAVIGATIONAL UNITS. OPERATIONAL CHECKS OF BOTH NAVIGATION SYSTEMS WERE GOOD WITH NO FURTHER DEFECTS NOTED.