I can't help you with the power issue, the locks I can. They work on a pneumatic system. If a line breaks or gets a small hole in it your locks are affected. My hatch lock went out a few years ago and the dealer fixed it under warranty. The entire lock system is pneumatic. There was a repair kit available, you can have the dealer do it, maybe even a TSB on it. If you are handy and patient you may have a go at it yourself. Problem is finding where the line is broken. You should be able to hearthe air hiss through it, where as when its not broken you don't hear anything. Hope this get's you aimed in the right direction.
Pat