As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, THE CAPTAINS FMC FAILED MOVED AUTOPILOT FROM "A" SIDE TO "B" SIDE. BEFORE THE CHECKLIST WAS STARTED, THE CAPTAINS FMC RESTORED ITSELF. GROUNDED - YES. T/S PER FIM 34-61 TASK 807. LEFT FMC SHOWED A "RATE" FAULT AT 0002Z ON LAST FLIGHT. PERFORMED TEST OF L-FMC PER THE FIM REF AND FMC PROMPT SHOWS ON MENU PAGE OF MCDU. CK'S GOOD FOR SERVICE.