While we can offer you info about the DL4's general product specs here on the support forums, the sort of repair assistance details that you're asking for are not in the scope of what Product Support can offer; this is by Line 6's Company Policies.

This type of information is only available to our Authorized Service Center (ASC) technicians. In addition to schematics, repair support, they are the only entities that can order replacement parts from the company.

Please give your local ASC a call.

http://line6.com/support/serviceCenters/