As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH AUTOPILOT ON, AND ALT HOLD ENGAUGED. THE ALT HOLD LIGHT GOES OUT INTERMITTENTLY. WHEN ALT HOLD LIGHT IS OUT, THE ACFT PITCHES UP. AIRCRAFT RETURNED SAFELY TO BASE. MAINTENANCE R & R THE STALL WARNING COMPUTER IAW MM 27-31-04. ADJUSTED THE STALL WARNING COMPUTER IAW MM 27-31-00. PERFORMED AUTOPILOT OPS CHECK IAW MM 22-10-00. OPS CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.