TL;DR Turned out to be bad stab jack, installed in the airplane for less than 2 years.
F900EX
customer reports he can hear the main relays click… no up or down, no report on the autopilot.
Note, thus is the HStab jack that has internal normal limit switches. The other stab jacks have external limit switches in 4 CF.
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PowerPoint print so that you can draw on it. (LibreOffice Impress)