Hi Radd
You have got some great advise already here. Not sure of the specific issue and or age of your truck, but Combilift have a dedicated Technical Team that are there to help. If you still need support, you can complete a quick technical support form at the bottom of the main combilift.com web site or direct link https://warranty.combilift.net/technical-support-form/. The form only asks for the minimal info so the team can quickly help you. There is no login required and no charge for this support.
Hope you get this resolved
Richard