I have had my LS2436 for about two years, the lens cracked so I ordered a replacement lens from Boss, after putting the lens in I seem to have lost power, the engraving is not as sharp as previously and the strength needs to be set a lot higher than previously.
I have removed the lens cleaned it, I have re calibrated the auto focus , I have the lens flat side down, so that the laser is hitting the rounded side of the laser first, I have checked the air from the compressor and that is working properly, I have checked to make sure the chiller is on and full.
I have also made sure there is no fluid in the air compressor, and the lens doesn't seem to be getting water on it.

I have a call in to Boss but would be interested if anyone else may have any ideas