As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACY - FLT 256 - DURING CLIMB CONFIGURATION THE AUTO PILOT DIS-ENGAGED EXPERIENCED A VERY BRISK PITCH DOWN CONDITION. MAINTENANCE COULD NOT DUPLICATE MALFUNCTION. RAN FULL SYSTEM SELF TEST, FOR HALF HOUR OPERATIONAL CHECKS GOOD IAW DC-9 MM, CHAPTER 22-10-01. AIRCRAFT RETURNED TO SERVICE. (M)