You can send the lens to the CPS facility that his account is with. They will charge you, its probably not free.
Canon will not just calibrate a lens to a body. If the body is off, that will not fix the issue, since the lens would than be off on every other body.
If your body is off, they will adjust the body. If your lens is off, they will adjust the lens to a calibrated body, hopefully your newly adjusted body.
There are many possibilities for the blurred image, including user error, it can be difficult to sort them out.
Generally, if only one lens has a blurry image, and your other lenses focus accurately on the body, it isn't necessary to send in the body. Just have the lens repaired / calibrated.