help me identify this computer PSU IC

Hi everybody,
A friend of mine gave me this PSU that no longer works.
It's a FSP350-60GHN(85) >(this without the "plus") **broken link removed**
I opened it and seems like an IC (opamp?) is half melted, so I said why not giving a try and change it before throwing it away (or dismantling it
Problem is that due to the melting the name is half cancelled, I can't seem to find a schematic online to retreive the IC model, and I'm quite a newbie in electronics so I don't know what model it could be. (I suppose its something that different PSUs may have in common)
At the links below you can find the IC, the whole pcb and the place where I took the IC from.

Thanks to anyone that will help
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Once you get the IC, keep in mind that prior even thinking of just replacing the burnt one you should find out the reason of the failure.

I do not have enough information to help you.