how to find an existing enhancement point

I wonder if there's a way to know if any enhancement point has been developed within a standar function and where it is. My problem is that i'm using this function and it is not working as it should. My co-workers say that there probably is an enhancement point somewhere but they have no clue where it could be and they don't have any documentation of the development either. I've tried to debug the function without good results. Thanks for your help.