Just got a problem with one of the gearshift levers on double top mounted control unit. It was put in to neutral and disengaged by pushing the red buttom as normal- now the pushbottom will not go back in engaged position. Everything is well lubricated.<br />Is there a way to fixed it or do I need to replace the complete unit ( one side)? _ cannot se that the Alubox where the lever/handle is mounted on can be opned.