I didn't leave a note with the gun, but when I spoke with whoever it was on the phone they said that they will be expecting the gun to arrive and they wrote a note about what was wrong to match with my gun when it came in. So hopefully that is enough. We'll see.
How long do you think it will be until it returns back to me?

Recieved my Mini back from Kee today! Gun works great, thanks Kee for the great service!

Why would it leak out from between the back of the gun where the frame meets the bolt guide?

Hmm, could be loose, your air tube may need to be slightly tightened....a few things.

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A bad o-ring?

There is a long oring (Part #21)between the ait transfer plate and the body that could be out of its groove, needs oil, or the frame screw is too loose.

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I believe he is talking about inbetween the bolt guide, and the thing you put the body.....

Like, at the back of the gun where it sticks out.

EDIT: and try replacing the furthest back o-ring on the bolt guide.

yea I looked, the furthest back oring is fine no damage to it at all. How would I tighten the boltguide to the frame? (Other than the long screw on the bottomside.)
It isn't the big o-ring (transfer plate gasket) Its new and snug in place with a little lube.