RVDT
the first instance you could suspect a TR control failure as the pedals would be pretty stiff and thats all.
agreed, but only a control issue (stuck pedals) not a TR drive failure which is what was intimated by Nubians comment - hence why I mentioned other control loads.
However the rest of your info is very interesting and, like Gullibell, puts me off the idea of flying the 350. Perhaps an engine or transmission driven pump (directly, rather than via a belt) might have been a better design solution.