As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT FMC SCREEN HAS LINE GOING THROUGH IT FROM L3 TO R3 BUTTONS. GROUNDED - YES. CONFIRMED DEFECT - CAPTAIN'S MCDU DISPLAY HAS FAILED LINE OF PIXELS. REMOVED AND REPLACED MULTIFUNCTION CONTROL UNIT DISPLAY REF B737-800 AMM 36-61-01/401. OPS CHECK GOOD. NO OTHER DEFECTS NOTED.