HPLC1100 Outlet valve pump leaking and bubble issue

Hi!

I'm encountering ongoing leakage from the outlet valve despite replacing the cap assembly. This persists whenever I close the purge and start a run. Furthermore, when purging to remove bubbles, I'm still observing a significant amount of bubbling in the waste tube.

I'm uncertain if the bubbling relates to the leakage or other issues. Can you suggest which component might be causing this? Or what part could be replaced to resolve these persistent leaks and bubbling?

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