Pump Leak Rate Test Failed

Hello,

I have been conducting Pump leak rate test on 1260 Infinity II (G7112B, 1260 Binary Pump) Module. Lab Advisor version: B.02.10 [253] SP1.

I have tested it several times, but result is always the same (Primary Channel(s) leak(s) somewhere), see Picture 1.

I replaced almost all the spare parts (AIV with cartridges, OBV, Pistons, seals, capillaries, Purge valve and etc.) with exclusionary principle, but problem was still alive. 

Than I changed the configuration to "Without Damper and Mixer", it passes every time, when I do the test, see Picture 2.

What should I check to solve the problem?

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