Air leak top of the transmission

Air leak somewhere from top of the transmission found one at the hose that supplies air to range selector. I got that fixed but I can still hear hissing I used soapy water but I can't find anything. I am loosing air from secondary tank decently quick. Could range selector be leaking internally somehow?
Eaton Fuller 10 speed

 

No those are good I was able to cut the leak down it still leaks slowly over time at least you can't hear anything. I had soap check every connection I can think off air bags, regulators, Chambers you name it. But I am happy with it now thank you for replying