As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 2392: ON CLIMB-OUT, NR 1 PFD ATTITUDE AND HEADING FAILED. MAINTENANCE REMOVED AND REPLACED THE NR 1 AHRU IAW QX MTC #6342101. OPS CHECK GOOD. AIRCRAFT IS CAT III WITH PLACARDS REFLECTING THAT. AIRCRAFT RETURNED TO SERVICE.