As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE AIRCRAFT RETURNED, DUE TO A FLIGHT MANAGEMENT COMPUTER NAVIGATION DISCREPANCY. *S/D* FLIGHT RECORDER DATA INDICATED THAT THE FMC POSITION WAS APPROXIMATELY 34 NM NORTHEAST OF THE ACTUAL POSITION AFTER PUSHBACK. THE IRU WAS MISALIGNED, OPERATIONS CHECKED NORMAL AFTER REALIGNMENT.