As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FO'S MCDU DISPLAY INTERMITTENTLYY LOSING INDIVIDUAL CHARACTERS ON BOTH FMC AND ACARS PAGES. GROUNDED - YES. RELEASED PER MEL 34-36L, FO MCDU INOP. SEAMC ARNIE NOTIFIED @ 2105Z. REMOVED AND REPLACED FO MCDU AND PERFORMED GOOD ISNTALLATION TEST, THIS CLEARS MEL 34-36L SEAMC NOTIFIED WILL, AS PER AMM 34-61-01/401.