Most commonly at the ground point on the input jack or at the ground point at the bridge. If you have noticed your input jack coming loose or wiggling around...... it's the ground contact on the input jack.
Your PRS SE is a nice guitar - However, even nice guitars are made in Korea. This doesn't mean the components are bad, but sometimes the workmanship and "fit and finish" of the guitars is a little less than standards of American made equipment. It's pretty common to have poor soldering in those guitars. Hell, I have guitars that I have rewired that have this issue after a year of so of knocking them around...