I’ll put it in this topic because it seems appropriate.
During straight & level flight (AP KFC150 in ALT & HDG) attitude indicator (KI256) slowly starts to pitch down to -15 degrees. AP reacts with pitch up trim and acft starts to climb. After a couple of ap on/off cycles the pitch up becomes rather agressive. Nothing to do but to handfly the remainder of the flight.
The next flight, same problem occurs.
The bank indication is spot on, so only the pitch axis is way off.
I guess I have a bearing problem. Is this something that can be repaired (<1K $) ? I’d like to upgrade to glass, but now is not the time. And I’ll need the KI256 for the AP...