I've noticed a few black / dead pixels in evenly lit areas e.g. sky. These are only visible at high (400%) magnification. I tried the Pixel Refresh and Sensor Cleaning functions but they are still there. I'm wondering if this is normal and I should just accept the dead pixels or whether I should request a replacement since the camera is only 2 months old. I can see looking back over the images that the dead pixels have been there since the camera was new. I thought the Pixel Refresh function might solve the problem but the manual (p60) only refers to correcting 'bright spots'.