As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DTW - FLT 566 - CO-PILOT'S ALTIMETER NEEDLE OSCILLATES CONSTANTLY AT ALL ALTITUDES. FOUND NR 2 AIR DATA COMPUTER SERVO OUTPUTS BAD. REMOVED AND REPLACED NR 2 AIR DATA COMPUTER. SYSTEM OPERATIONAL AND LEAK CHECKS GOOD IAW DC-9 MM CH 34-12-0. (M)