Hi mark,
I don't have schematics, but you can contact Focusrite directly. I'm sure they'll help you.
I had a problem with one of their units (fixing still in progress, bacause of lack of time) and when I contacted them with specifics about where the problem is (and what happens or does not happen!), one of their technicians gave me in-depth instructions of how to approach and fix it. Tracing the layout of the 'problem area', he explained to me the signal flow with exact resistor values, pin layouts, transistor IDs, optos, etc.).
Unfortunately, some of the components that Focusrite use are proprietary, but they have spare parts, in case you need any. I must say that Chris at Focusrite has been most helpful, patient and kind...
Good luck