As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INFLIGHT HAD MOMENTARY DUAL FMC FAILURE HAD A/P+ A/T LIGHT ILLUMINATES ALL ND DATA GONE, AND VTK DISPLAYED. SYSTEM APPEARED TO FULLY RECOVER AFTER APPROX 40 SEC. GROUNDED - YES. PERFORMED OMF SHOWS NOT ACTIVE FAULTS. FOUND MSG NBR 34-69001. THERE WAS INTERMITTENT FAULT. PERFORMED GOOD FMC OPS CHECK. REF B737-9 IFIM 34-61-00-810-836; B737-9 AMM 34-61-00-710-801.