As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON ARRIVAL INTO SEATTLE FMC 2 FAILED MULTIPLE TIME COMING BACK EACH TIME APPROX 2 MINUTES LATER FMC 1 WAS MEL' D RESULTING IN DUAL FMC FAILURE. GROUNDED - YES. REPLACED FMC 2 REF B737-800 AMM TASK 34-61-02-400-801. PERFORMED SOFTWARE LOAD PER AMM TASK 34-61-00-470-806 AND FMCS PERFORMANCE FACTOR ADJUSTMENT REF AMM TASK 34-61-00-800-801. OPERATIONAL CHECK NORMAL REF: AMM 34-61-00-710-801.