Under the car you’ll see a wire coming out the gearbox next to a 59mm square metal plate. Disconnect this wire from the bullet connector about 200mm from where it enters the gearbox and the wire dangles
free. With a multimeter check resistance from the free end of the wire to G/box case which should be around 15 Ohms. If it’s more than 20ohms, remove the solenoid by
taking the square plate off. Clean up the copper coloured circular metal wings until shiny, refit solenoid. Remove and clean OD filter, top up oil. Should now work.
Well its worth a try if you’re having problems …….