6120 LC/MS- 288 peak

During Atune a peak at 288 and 1808 are present. New tune solution still peaks present. Put just ACN in tune bottle and ran a scan, the peaks are not there. I had also isolated the selector valve as i thought that might be a possible source of contamination, but pretty sure the contamination is present in the tune solution. Has anyone seen this before or have a remedy for it? tune mix is G2421-60001

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