As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FIRST OFFICER`S ALTIMETER INOPERATIVE, STICKS AND JUMPS CONSTANTLY TRIED FIRST OFFICER SWITCH TO CAPTAIN`S ADC, SAME PROBLEM. NOT RVSM. FOUND INDICATOR REPEATED EXACTLY THE SAME FAULT THAT IT EXHIBITED ON THE LAST ACFT IT WAS INSTALLED ON. R & R FIRST OFFICER`S ALTIMETER AND NOW OPS NORMAL. REF MM 34-12-21-04.