After I did a fine alignment of the X green beam path on the PSL table, the X arm beat-note was also obtained. 
Here is a picture of the latest setup. The blue lines represent S-polarizing green beams.
During I was working on the PSL table HEPA was at 80 %, and after the work I brought it to 20 %.
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I will do a fine alignment of the X arm path on the PSL table and try obtaining the X arm beat-note tonight.
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