When I had my pitch servo not being detected I removed the servo from it's location and plugged it directly into the Skyview display using a known good cable. This proved the fault was in the servo and not the wiring. Dynon replaced the servo and the problem was resolved.
My fault finding approach is unsophisticated, I prove each component in the chain one item at a time until the fault is isolated. Then I replace or fix the item that has been proven to contain the fault. Works for me every time.
Good luck 😊
2018 Donation Made