As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI OUT IN SEA HAD "FMC DISAGREE" ON MFD'S & FMC'S. PERFORMED QRH PROCEDURE & MESSAGE WENT OUT. GROUNDED - YES. FLIGHT CREW QRH CORRECTED PROBLEM AND IS AN ACCEPTABLE MAINTENANCE ACTION - INFORMATION NOTED. L & R FMC'S OP CHECK NORMAL REF B737-900 AMM 34-61-00-860-801 FMC LANDING/TAXI NUISANCE ERROR. OK FOR SERVICE.