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Been reading about that. I don't think it's an option on a 450d?
This guy offers a bit of insight https://www.dpreview.com/forums/post/31460122 I don't think it's worth sending this camera off to be serviced, right? It's 10 years old...
Set the AF microadjustment in the camera settings to back focus all the time. Experiment until it’s pretty accurate