As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPT CDU WENT INOP AFTER TAKEOFF. CREW WAS UNABLE TO RESTORE THE SYSTEM. DUAL CDU REQUIRED PRIOR TO ENTERING CLASS 2 RNP-10 AIRSPACE. AT JFK, THE CENTER CDU WAS SWAPPED WITH THE INOPED CAPTAIN'S ONE AND DEFFERED. DEFECTIVE CDU WAS REPLACED AT LHR.