As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL 380 CAPTAINS SIDE MCDU PANEL CALL FAIL AND MESSAGE OFST LIGHT APPEARED AND DISPLAY WENT BLANK. A BITE PASS MESSAGE APPEARED BRIEFLY, THEN WENT AWAY DISPLAY BLANK AGAIN FOR 10 SECONDS THEN ALL RETURNED TO NORMAL. GROUNDED-YES. PERFORMED BITE CKED ON MCDU AND NO FAULTS FOUND. A/C OK FOR SERVICE, REF B737-800 FIM TASK 34-61-00-810-804.