eureka
(greek for 'to vrika' ... "i found it")
nothing like a full bottle to flush out the leaks
OK, so all my kegs were pouring fine, except for one, which wasnt fully carbed, this was pouring slower as the beer would have absorbed the pressure in the headspace
so i connected my new bottle up, leaving the manifolds shut, and turned the bottle on, set to a pressure of 150 kpa and then turned the bottle off
after 15 minutes the high pressure dial started to drop, whilst the low pressure guage stayed constant
i though the problem was where the reg joins the bottle, so i got my soapy water out and tested that join ... only to find nothing
i started to move down the chain ... and then ... bubble bubble bubble
the regulator has a little hole here ...
this an exit point for gas to be released when you reduce the pressure in the regulator, it lets the excess pressure from the keg headspace vent back up the line and through this hole
well, you would expect the gas to stop flowing when the pressure equalises, but it just keeps flowing, obviously a faulty regulator
looks like i didnt pick it up with my soapy water first time round as the bottle pressure from the near empty bottle wasnt enough to force the leak
bottle now turned off until i replace the regulator