Is Surgery Required to Deflate a Saline Implant?

I got my implants 13 years ago, and have hated them from the first day. They both looked so high up near my collar bone, and did not look natural. Once one deflated, I quite like it's appearance. I really do not want to remove either implant at this time. Nor do I want them replaced, ever. However, I would like to deflate the intact implant to match it's counterpart. Is this possible? Or, is it necessary to have both removed entirely at this time?