Recently I notice that I'm getting some reddish and greenish splotchiness with pictures taken with my Powershot G2. It's especially noticeable when taking pictures of even gray surfaces. Seems to be there with all iso settings. I don't see this problem in older pictures.
Does this sound like a problem with the optical sensor inside the camera? Is it fixable? The camera is out of warranty, and these cameras are only selling for around $80-$100 used on eBay, so it doesn't seem worth spending a lot on repair costs.