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I followed the guide for replacing the DC magsafe board (MacBook Pro 13" Unibody Mid 2012 MagSafe DC-In Board Replacement) and it worked. However, I botched step 9 and pulled the camera cable out of its metal connector. Is there a guide or part for replacing the camera cable?

I’d seek professional help. Replacing the cable is a much more complex task than the DC-in board, and you had problems with that DIY repair. A professional may be able to reconnect/replace the broken connector, eliminating the extensive chore of replacing the cables. Soldering computer components is a very advanced DIY skill requiring special tools, solder and lots & lots of practice. If this Answer is helpful please remember to return and mark it Accepted.