Seconding Alan's remark about the wires.  My experience is mostly with
overloaded power transformers.  If they overheat, it's the run of wire to
the terminal that melts because the rest of the wire is a big thermal mass.
In a more general sense, I always do a post mortem on the bad part to see if
I can spot the problem.  Many times I was able to fix it. Even if not for
re-use, but at least to prove that was the problem.

As to the schematic, sure the font got messed with, but I learned long ago
to paste it into a fixed width editor.  As stated elsewhere, nice job!
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