Wow!, you changed names from Jose Mierda to Juan Mierda! still the same mierda than before. I made my coments before hoping you will try to replace it at least with a used american made old actuator and more importantly hoping I was wrong and it was not the actuator.
I beleive you said you opened it but did not see anything broken , like I said my Moteck (even a heavy duty) had several plastic teeth broken for no apparent reason. And yes, I will spread this Evangelio until I die. I tell this true story even to people that have digital cable, lol.