I dropped my MBP onto the pavement (fell out of my LowePro FastPack 350 as it wasn't zipped up) and dented up the rear clamshell for the screen and the corner of the upper/lower case.
I went on eBay (as ifixit.com was sold out of the part I needed) and bought the rear case for like $50 shipped. I took the MBP in for some existing problems and they asked about the corner, and I told them that my 1 series Canon came into contact with it (the camera weighs almost 4lbs with a battery).
Irony of this is that Apple replaced the whole screen/clamshell, so I got another new one, then got a whole new computer.
I would look at ifixit.com or on eBay for the part. Do you have any pictures?
Sounds like mine, can you explain how you fixed it and had apple service it?