I always refer people and also take my camera's for cleaning and repair to
Hi Tech Electronics
on Canal Street between Orchard & Ludlow.
212 219 3794
They are inexpensive and get the job done on site.. they don't ship your camera out to any service centers or anything.. and best of all they get the job done fast!
If they don't have to order any parts you can usually pick up your camera the next day.