Agilent 1290 Infinity II Binary Pump Primary Pumphead Pressure Issue

The primary pumphead on channel B of our Infinity II binary pump will not come up to pressure during the pump leak rate test, it reaches barely 600 bar and stays there for 30 seconds before dropping. I just replaced the pumpseals and rear seal wash seals and everything is tight, no visible leak. I have also tried purging with IPA. What can I do next to troubleshoot?

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