As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A-AUTOPILOT TOC F/L 320 SELECTED ALT HOLD A/C WENT 100 FT HIGH THEN DESCENDED TO 31500. DISENGAGED AUTOPILOT HAND FLEW A/C BACK TO F/L 320. SELECTED AUTOPILOT-B ALT HOLD. FOUND ALT HOLD JUMPER WIRES FROM AUTOPILOT-A PITCH COMPUTER AND NR 1 CADC PIN 64,65 SWAPPED. SWAPPED WIRES PER WDM 22-12-13. PERFORMED ALT HOLD SYSTEM PER MM 22-10-00.