As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT, RH FMC FAILED. WITH LH FMC PREVIOUSLY FAILED & ON MEL, ALL FLIGHT PLAN & PERFORMANCE DATA WAS LOST. RH FMC CAME BACK AFTER 2-3 MINUTES. GROUNDED - YES. ACCOMPLISHED FIM 34-61 TASK 836 #2 FMC RESET. OPS CHK NORMAL. SEAMC PAT NOTIFIED.