As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APPROXIMATELY 3 HOURS INTO FLIGHT BOTH FMC FAILED 5 MINUTES LATER FMC RETURNED TO NORMAL OPERATIONS. THEN APPROXIMATELY 10 MINUTES BOTH FMC FAILED AGAIN FOR ABOUT 10 MINUTES. ONCE AGAIN FMC'S RETURNED TO NORMAL. GROUNDED - YES. PERFORMED FMC BITE FOUND FAULT FMC-R PMG FAULT. REF FIM 34-61TASK 807. FAULTS WERE FOUND TO BE INTERMITTENT.