It was back in late 2004, it got dropped with a 1VHs. Back then Canon did fixed price servicing, it cost $175 plus shipping to them. The lenses are actually designed to break like that to save the glass, which it did, there is a plastic section the mount is attached to and is a designed weak point, but I did kill the circuit board and all the ribbon cables too......
The lens has been back to Canon a couple of times since for servicing and misalignment corrections but that was due to different incidents, the last time was well over $300 with no obvious damage just really bad IQ.