I dropped my pi with the SD card in and the SD card holder broke. I have got a replacement card holder but have noticed that 3 of the copper pads cracked off the board and stayed stuck on the broken holder. I can't see a line running to these pads on the PCB so not sure how / if possible to intercept the track to these pads to resolder the new card holder in place. 2 of the broken pads are the card detection on the left and the other is 1 before the card detection on the right.
Not a great pic but you can get the idea..