As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HEADING MISMATCH MESSAGE ON PFD'S AND MFD'S. CAPTAIN HEADING MATCHES COMPASS. F/O'S OFF BY 20 DEGREES LEFT. DIVERTED AND ACCOMPLISHED UNEVENTFUL LANDING. R & R NR 2 AHRU COMPUTER IAW T/C 6342101, AS PRECAUTIONARY, COULD NOT DUPLICATE. COCKPIT PLACARD REMAINS CATIII. MX CONTROL 64141 HAS BEEN NOTIFIED. RETURNED TO SERVICE.