The camera is back! It seems like we've been without our camera forever. In reality it was for about 2 weeks. It was gone for a week, then back for a few days, then gone for another week. Canon's repair statement indicated that they had replaced the entire shutter assembly. Which, I assume is a pretty major repair.
The camera has been taking pictures without the dreaded "err 99" returning again for a few days. It seems to me that Canon really dropped the ball on the initial repair. After all, if the shutter assembly needed to be replaced, it should have been done the first time! Oh well, stand by for some new pictures in the next few days.