As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW DIVERTED AFTER THE NR 1 PRIMARY FLIGHT DISPLAY FAILED AND BOTH NAVIGATION DISPLAYS WERE DEEMED UNRELIABLE WITH EXCESSIVE HEADING DISCREPANCIES. MAINTENANCE REPLACED THE NR 1 IRU AND ALSO THE R2-47 EMERGENCY AC POWER TRANSFER RELAY AND R2-100 DFGC TRANSFER RELAY AS A PRECAUTION. NO OTHER DISCREPANCIES WERE NOTED AND A SUCCESSFUL RETURN TO SERVICE CHECK WAS PERFORMED ON BOTH DFGCS IAW AMM 22-01.