Volvo D13 Transmission air leak

Recently the dealer rebuilt my ishift under warranty, now when i got back on the road i noticed secondary air tank going down slowly, hearing the compressor cutoff about every 6-7 minutes at highway speed both with and without trailer. I noticed the biggest air loss when downshifting (engine braking) from highway speeds, 4-5 psi per downshift. Also when upshifting, accelerating through the gears from a stop. In city driving (minimal break use) the compressor cuts out every 2-3 minutes….no air loss when idling or sitting overnight. Took it back to the dealer they said there is no issue. I’ve never lost more air in the tanks from shifting than braking!! Anybody else experience this?