Beg pardon - missed the point about not being able to introduce
anything. Thought you may have been able to get access to the
fluid for even a very short time

Why don't you try an audio test and see how it goes. You might get
lucky or it could be back to basics and just trace them manually.
With them all connected together like that you'd have to have a
pretty good result to be confident that it would work over the whole
system

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