So I had an STEC-30 installed about a year ago - it worked perfectly, and I loved it. I then had my plane treated with ACF-50 a few months ago. Last weekend my altitude hold stopped working- the Alt hold light comes on when I try to engage it, but it does nothing - i.e. no trim alarms etc. So I took it to the avionics shop today. They said that they found a ton of gunk inside the elevator servo that looked like the anti-corrosion material settling out into it. I feel like I'm being punished for trying to take care of my plane. My avionics shop spent hours removing and cleaning up the se