Endoscopy. If you and your physician suspect erosion you should have an upper endoscopy. By placing a camera into your stomach your doctor can see if the band has eroded through you will need to have your band removed and possibly consider other surgical options if necessary.
A scope. If you want it out, you should talk with your surgeon, and arrange to have it out. But the reason you want it out is the most interesting question- it may be it is too tight, it may be that it is too loose, and it may be that you just don't want to change the lifestyle with the band.