As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, THE AIRCRAFT EXPERIENCED A SUDDEN ROLL AND PITCH UP CONDITION. AIRCRAFT DIVERTED TO ANC AND LANDED WITHOUT FURTHER INCIDENT. REPLACED THE NR 1 INERTIAL NAVIGATION SYSTEM COMPUTER AND AUTO-PILOT ROLL COMPUTER. OPERATIONAL CHECK GOOD.