As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FIRST OFFICER'S ALTIMETER INDICATES 150 FEET LOWER THAN CAPTAIN'S SIDE AT FL 340. STAND-BY ALTIMETER INDICATES 300 FEET HIGHER THAN CAPTAIN SIDE AT FL 340. (FLT 6456) PURGED NR 1 AND NR 2 STANDBY PITOT SYSTEMS AND REPLACED NR 1 AIR DATA COMPUTER.