As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON TAXI OUT FMC DISAGREE CAME ON BOTH FMC'S STAYED ON FOR 6-8 MINUTES AND BOTH WENT OFF AS WE TAXIED IN. FMC DISAGREE EXTINGUISHED BEFORE AIRCRAFT RETURNED TO GATE. PERFORMED FIM TASK 34-61-00-810-835 FOR PRECAUTIONARY PURPOSES. DETERMINED TO BE INTERMITTENT NUISANCE MSG. NO 30 DAY HISTORY.