On the topic of air leaks
I ran into a lot of leaks on an air system I had installed (found them after I had paid the bill unfortunately).
Rather than take everything apart I got some capillary thread locker, Loctite 290 I think, and went round dosing every connection with a little squirt when the system was not under pressure. Worked like a charm except on one or two fittings that I found were barely even finger tight. Sure saved a lot of time.
An open mind is a virtue...so long as all the common sense has not leaked out.