I looked on eBay too and concluded that I could buy another analog board or even pick up an entire Mac Plus nearly as cheaply as I could repair these.  

The problem with that is ALL of these analog boards are almost 30 years old and starting to fail.  Even if I buy another it may fail in the next year or two.  I just feel like it is better to repair than replace if I can manage it.

I found a source for the 157-0042B at $25

The flyback from an SE is compatible right?