As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DUAL FMC FAILURE WITH VTK ON CAPTAINS SIDE AT 18500 FT ON ARRIVAL. BOTH MAPS FAILED FOR APPROXIMATELY 30 SECONDS. FMC AND MAPS RESTORED TO NORMAL OPERATION WITHOUT CREW ACTION, LNAV AND VNAV REMAINED NORMAL. ACFT GROUNDED. ACCOMPLISHED BOTH FMC SYSTEM BITE TEST PROCEDURES IAW FIM 34-61 TASK 801 AND BOTH FMC OPS CHECK NORMAL. NO EXISTING FAULT.