Hi

You have already recieved great direction and advise.

But if you still need technical support for this or any other issue, please go to www.combilift.com, scroll to the very bottom, you can submit a "Technical Support" request. The form asks for truck SN, contact tel no, etc to help identify the problem and to contact you back. The tech team will then contact you. Here is a direct link here https://warranty.combilift.net/technical-support-form/

Hope this helps,
Richard