Shop Air Update

Here's the basic layout of the shop.  The circle with an "x" in it represents a ball valve.
​
Below is a pic of the chart in ThingSpeak. The slopes of the different curve segments are calculated below:

Valve(s)	Description	Loss (psi/hr)
All Open (except 8)	"Normal" Shop mode	15
2 closed	Shortest run, closest to compressor	<1
4-9 closed	Isolate the air lines from the equipment	4.1
4,6-9 closed (5 open)	Just the shop air hose	4.3
4,9 open	Just the CNC	9
6 open	Just the Bridgeport	13.2
7 open	Just the lathe	8.3

So it appears the best the system can do is around 2 psi/hr. That's with as little of the system as possible in the mix, i.e. best case. That said ,there's still the compressor check valve, a water separator/filter, air line quick disconnect fitting, and 3 ball valves in the mix. It's possible the air line quick disconnect fitting could be the bulk of it, however the filter also has an auto drain feature which could be leaking too.

UPDATE: I've been opening up each end point separately and it looks like the Bridgeport is kinda a problem. I'm pretty sure it's the Kurt Power Drawbar IN/OUT switch - I knew it was leaking, but it's leaking more than I wanted. I think the rest of leaks are probably a collection of minor things I'll have to find by soapy water, etc.