As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN FLYING WITH MA AND A AUTOPILOT ON. WHILE FLYING AT FL 380 MOMENTARY LOSS OF LEFT FMC FOR 30 SECONDS. VTK FLAGGED ON CAPTAINS MAP AND LNAV/VNAV DISENGAGED. LEFT FMC RESTORED ITSELF IN APPROXIMATELY 30 SECONDS. ACFT GROUNDED. PERFORMED FIM 34-61-00-810-836. LEFT FMC OPS NORMAL. INTERMITTENT FAULT IAW FIM. PERFORMED FIM 34-61-00-810-801. FMCS BITE. BITE TEST OK.