Smoking MacBook Pro Power connector

Hello, I am working on a 13" MacBook Pro for a coworker. She said one day she plugged in the power cable and smoke started rolling from the laptop near the power connector. She quickly unplugged the power cord from the computer and because it was 1 week out of warranty it got put in the cabinet and sat for a couple months.

Yesterday I disassembled the computer and the power connector board has some slight discoloring and there does appear to be a damaged component on it (it is small, looks kind of like a SMD Voltage regulator, but I'm not sure).

My question is this, Has anyone had this problem before and successfully fixed it? Is it just the power connector board or could there have been another failure on the mainboard that caused the connector board to fail, and subsequently cause a replacement to fail if I were to get one (I loked over the mainboard and it appears OK)? Could the power adapter have failed and caused this problem ie over-voltage (the cord and brick appear to be in perfect condition)?

Thanks

-Brad