apci tuning issue

Hi We have an APCI on our 6120 MS. 

Thanks to Dannymobbs we cleaned the capillary and put it in. Negative tuning is coming out but the positive is showing a high steady peak over a wide range of m/z. Not a peak but suddenly increases at the target m/z then stays up high until the end of the m/z range (looks like a cliff). Any suggestion on this symptom?

Also I was concerning that when we previously had issues with the tuning (no peak or signal but noise came out), we kept tuning and the system recommended doing some peak width, axis calibration checks. I was wondering if this could have altered the tuning parameters (when no peak was there) but now even if we have peaks, it's not tuning properly because of the interrupted parameters? I would appreciate any advice! Thank you.

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