As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN`S MCDU IS BLANK. ACFT GROUNDED. TROUBLESHOT FOUND CAPTAINS CDU BLANK. DOWN POWERED ACFT, SYSTEM DID NOT RESTORE. REMOVED REF AMM 34-61-01. INSTALLED SERVICEABLE UNIT REF AMM 34-61-01. GROUND VERIFICATION CHECKS GOOD. OK FOR SERVICE.