As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 84 - SAN - NR 1 IRU FAULT LIGHT ILLUMINATED IN FLIGHT. IN ATT ADI WOULD NOT RECOVER AND HEADING SELECT WAS UNSUCCESSFUL, HEADING SLEWED TO MANUAL SETTING BUT IMMEDIATELY STARTED TO DRIFT. RETURNED TO SAN. MX REPLACED NR 1 IRU. BITE CHECK NORMAL. (M)