As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ENGINE START, RIGHT FMC FAILED, RECOVERED AFTER APPROX 90 SECONDS. GROUNDED - YES. ACCOMPLISHED BITE ON RIGHT FMC. FOUND "WATCHDOG TIMER" MSG. PERFORMED BIT CHECK ON GPWC. NO FAULTS NOTED. OPS CHECK GOOD IAW B737-800 FIM 34-46 TASK 854.