As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT BETWEEN 4000-3000',250 KIAS. DUAL FMC FAILURE. BOTH FMCS RETURNED AFTER APPROXIMATELY 20S. ALL DATA LOST. GROUNDED - YES. FOLLOWED B737-900 FIM 34-61 TASK 836. PERFORMED RESET OF FMC 1&2. ALL FUNCTIONS NORMAL. SUSPECT INTERMITTENT FAULT CAUSED BY OPS RESET OR DOWN MODE. BITE TEST OF FMCS SHOWED NO FAULTS. A/C OK FOR SERVICE.