As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT FMC FAILED 4 TIMES IN A 5 MIN PERIOD ( VTK AND LOSS OF MAP) AFTER 5 MINUTES IT RETURNED TO NORMAL OPS. FL 380, RIGHT AT TOUCH, LEFT FMC FAILED AGAIN, AND RETURNED AFTER ABOUT 1 MINUTE. GROUNDED - YES. REMOVED AND REPLACED LEFT FMC COMPUTER. SOFTWARE LOAD COMPLETE AND INSTALLATION TESTS ACCOMPLISHED PER AMM 34-61-02. THIS CLEARS MEL 34-36J.