As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOTH FMCS BLANKED OUT FOR ABOUT 10 SECONDS DURING CRUISE FLIGHT THEN RETURNED TO NORMAL. GROUNDED - YES. VERIFIED RFMC SHOWS L FMC HAD INTERMITTENT FAULT FOR (PRES POS LAT RATE) CYCLED BOTH FMC C/B'S. ACCOMP SENSOR STATUS FOR BOTH FMC'S BOTH SHOW OK. ACCOMP FIXED OUTPUT TEST FOR BOTH FMC'S BOTH PASS. REF B737-9 AMM TASK 34-61-00-710-801.