LW Diesel P0766 Trans solenoid D

[Smiddler]

Hello I have a Focus going into limp mode "Transmission limited function" the error is related to solenoid D this was happening approx 10 K ago the fluid was replaced and has been ok until now , I am considering removing the valve body and cleaning I have seen a Mondeo on you tube but it looks pretty tight under the bonnet of the focus , has anyone done this repair?