As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE AT FLIGHT LEVEL 350, CAPTIAN AND FIRST OFFICER ALTITUDE DIFFERENCE GRADUALLY INCREASED FROM 100 FOOT TO 500 FOOT WITH CAPTAINS ALTIMETER HIGH. REPLACED NR 2 CADC PER BOEING M/M 34-12-01, OPERATIONAL CHECK AND LEAK CHECK NORMAL PER 34-11-00.