Even assuming you can get the part, disassembling and, more importantly, re-assembling a PnS is no joke, you need to know the procedure and I don't think Canon will give or show you. I used to work in an environment which needs to disassemble/re-assemble laptops and you have to follow the procedure closely otherwise the whole thing simply cannot fit together. Every little space inside these compact devices is fully used and some of the screws and connectors are very tiny and easily damaged if you don't know what you are doing.
Short answer -- just bite the bullet and send back to Canon for repair.