wavy line through photos

[hulagirl428]

A few weeks ago, I started getting a wavy line thorugh my photos on my Canon dig Reb XTi.. This happened during VBS - one photo everything is ok, next photo has a line. My husband was the one doing the shooting at the time but he didn't drop it or bump it or anything along those lines. I've cleaned the mirror/lens, used compressed air, used a brush. Nothing even changes the line so I'm pretty sure it's not just a hair or piece of lint. I've tried looking inside with a light & magnifying glass and can't see anything (not that I really expected to).

Has anyone ever seen anything like this before? Of course, this happens right before I have two weddings to shoot so sending it off will really be pushing things. So any suggestions or ideas other than sending it for repairs would be great. If you've had this happen and sending it really is the only option, let me know that, too, and I'll get on it.