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Mysterious IC on Mac SE PSU daughter board

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I am really stuck with this one. 


I am 100% positive the 8DIP IC pointed with the red arrow is faulty. As I swap it from another working PSU gets the PSU going again.


The Ic has only a "177" marking.  I suspected it was an op amp but it was a guess. Not sure what this little board does. I tried the common single and dual channel op amps and also a OP177 a precision single channel op amp... no success.


Anyone have any idea of what IC could this one be?

Screen Shot 2021-01-01 at 7.13.44 PM.jpg

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Screen Shot 2021-01-01 at 7.20.36 PM.png

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