I'm hoping that someone can help. I have a 10 year old laser and had the laser replaced within the last year(It wasn't firing at all). I had a problem even before the replacement with the right side of the bed cutting material. It happens with acrylic, paper etc. It will mark the material but not nearly have the same power as the left side of the machine, I looks like it happens after the 16" mark on the ruler. Could it be that I need to replace the mirrors? Any suggestions?