Camera SLR Lenses

I brought the Alpha series Sony a77 about a few months ago new from a electronic wholeseller in NY. If I look straight into the translucent mirror it looked clear, but once I have the camera in a angle I see a marking on the plastic mirror. I try cleaning it and still remains on the plastic mirror. I think the NY wholeseller played with the camera, since Sony don't have a seal on the box. I was going to send for repair in Texas, but I heard the turn around is about a month. So I decided to order the part myself and replace it. The part is A1855640A and it cost me around shipped. It took a week to get here from Fedex ground. The replacement took less than a minute to get it back to new again. I love this camera. This video was shot on my Panasonic Lumix lx-5 Thanks to Carl Tr, it's the same model number for the a65.