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Let us know how it went ! Good luck

A faulty cad cell is all I know of. You might want to wait till someone with more experience answers as I am a beginner.

Yes, a BFP is a "Back Flow Preventer". Yes, no pumps were installed back in the day, these systems work by thermosiphon, the hot water would raise and the cold would drop, creating movement.

It might be your cad cell that is filthy, try cleaning it.

Also, not only are you supposed to NOT have monoflow T's on your two-pipe system, but you are supposed to have a circulator on you supply line and a BFP on your return line. But seeing you have monoflows, a circulator wouldn't be needed in this context. Correct me if I am wrong. Julio

Could a faulty foot valve have the same symptoms ?

I had no clue that soot would go that far into the burner. Interesting.