As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE LEVEL AT FL 360 AND WITH NEW CRUISE WINDS ACTIVELY LOADING GOT A SINGLE FMC OPERATION ON FIRST OFFICERS FMC VNAV/LNAC DISENGAGED AFTER 20 SECONDS AUTO RECOVER NORMAL OPS AFTER. GROUNDED - YES. PERFORMED FLIGHT MANAGEMENT SYSTEM BITE TEST REF B737-800 AMM 34-61-00 AND B737-800 FIM 34-61 TASK 801 GROUND VERIFICATION GOOD NO DEFECTS NOTED AT THIS TIME.