As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY BEFORE TOD DUAL FMC FAILURE NO VTK FLAGS WE LOST FMC NAV DATA FOR ABOUT 45 SECS BEFORE THE SYSTEM RESET AND NAV DATA WAS RESTORED SYSTEM OPERATED NORMALLY THEREAFTER. GROUNDED - YES. ACCOM B737-900 FIM 34-61-836 RESET BOTH FMC COMP. W/NO FAULTS NOTED,OK FOR SVC,SEAMC STEVE NOTIFIED, NON ASA EMP #2673245 CLASS 4.