d7000 mirror issue

Just checking to see if anyone here ever had an issue where the mirror gets stuck in the up position and then get an 'Err'. Then if I press the shutter button again, the mirror returns to the correct position. I tried removing batter, changed cards, changed lens, resetting to default yet I still get the 'Err'. This happened after I put on a new 35 1.8 and used it for a day. It was fairly tight to put the lens on.

Guess I will be sending this to the LA service center on WilShire. Anybody used this center before?

Thanks.