Browse through the thread entitled "Krell KSA 100 type amplifier" in the solid state forum. Someone made a number of posts of the schematics of the ML 23.5.
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I have a (mostly) Madrigal system. Last year my
#37 transport jammed, and I couldn't get the
drawer open. This is a known problem with this
model. I returned it to Madrigal, and they replaced
the whole transport assembly for free (the unit
was still under warranty). Their service department
is outstanding, and I've heard from others that it's
not outrageously expensive. You'd do well to send it
back. Sometimes they even throw in extras like new
caps or upgraded parts for nothing.