pan limits

For some reason as of late, when I am hovering or sometimes just on the ground I have noticed a very slight creeping pan to the right. I have calibrated the gimbal twice in hopes that that would help it, but it hasn't. Any ideas?

Just received my P3A and spent the evening unpacking it. It is used but appears to be in good shape. Not going to fly it for awhile but did fire up everything without props, just to make sure it all worked. So far so good. Still waiting on the manual. So here's what's concerning me. I can...