An air leak would mean high water as well. Check all three, 18,28 and 32. If the 32 and 28 are not in the correct ratio i.e. the same as air, then there cannot be a leak in the instrument unless the leak is magically selecting which gas it is letting in!! It is either coming from the cylinder or the somewhere in the supply line.

We identified the scrubber as it was only the 28 that was high, all the water and oxygen were being scrubbed out. Bypassing the filters and everything went back to normal so it was not in the cylinder.

Fitted a non-baseplate type scrubber to give continued protection to the system.

GCguy