A fun exercise in "diagnosis". It even has an old-school command-line interface that asks you what your problem is.
If you check out the very brief source code, you can probably see how to shape
this idea to your purposes. The parameters *trouble-tree* and
*node-contents* are the whole thing. The numbers in the tree correspond to the
index numbers in *node-contents*. You just shape the tree to match the
messages, and you can solve every problem evar.
Evar.