As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DUAL FMC FAILURE AFTER LANDING. FMC WAS VERY SLOW THE ENTIRE FLIGHT. DUAL OPERATION RESTORED ON IT'S OWN DURING TAXI BEFORE QRH PROCEDURE COULD BE PERFORMED. GROUNDED - YES. ACCOMPLISHED B737-900 FIM 34-61 TASK 801. NO CURRENT FAULTS. NO HARDWARE FAILURES IN FAULT HISTORY.