Well it depends somewhat on how it got stuck. If there is sand or dirt it there perhaps you can brush, vacuum or blow it out. You can try to gently jiggle it free too. But unless you get lucky it will have to be taken apart and repaired. That is a risky procedure to do yourself. It might require recalibration of the lens system. That requires the software and other expensive tools. So if you don't get lucky at first you have 3 choices, send it in for $ ervice, gamble on repairing it yourself or sell it as is on an auction site.
