Hi there I have a 110 td5 which won't go into reverse when engine running but will when engine off - 1st gear is a bit stiff otherwise 2,3,4 ok haven't tried 5. Live in a remote place & friendly local garage is suggesting hydraulic cylinder master & slave change out to start at the obvious external things - fluid levels checked. I have read other helpful posts about using ATF & checking dirty selectors/plunger - are these likely in this case & is the hydraulic topic a good place to start ? Thanks