Agilent 6120 ESI Tune losing signal for high MW


Comparing my tune signal now and months and years ago, I see a drop in signal. It used to be in the 300.000 for low mass and 50K for high. Now I have 50K for low and very low (~1000) for high. Last time only 290 for the high mass (see report attached).  So the Tune passes, but I must lose sensitivity.
I cleaned the capillary, and it did not help too much.
How should I proceed?
- clean ion funnel?
- clean optics?
- get a new capillary?

Any advice?

Thank you

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