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A good way to run down a hard short is ohming out the main B+ line. If you can detect the short with a DMM unhook all branches from the main line and recheck the main. If the main isn't shorted check the unhooked branches. If one branch has a short leave it unhooked (you can reconnect the others) and disconnect what branches from it and check those. Rinse and repeat till you find it or narrow it down to a few parts and wires and check those.
In one of your photos a red and green wire meet in the foreground and don't appear to be soldered... might want to do that.
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