Unfortunately not an uncommon situation. If you want a final confirmation I would swap the actuator with the opposite side and see if the code switches to that side. If it does you have your answer. If it stays on the original side there is an issue with the shock itself, whereby the shaft is not turning properly. Either way you'll be certain.
Frankly, however if you've done the diagnostics per the FSM it's fairly certain you have the correct diagnosis.
H
