NEW YORK (AP) — PBS is conducting an internal review following revelations that producers of "Finding Your Roots" may have violated the network's editorial standards after a request by Ben Affleck that the program not reveal he had a slave-owning ancestor. [...] Affleck has expressed regret for seeking to have the information omitted from the episode that featured the actor and aired last October. [...] in an email exchange between Gates and Sony Pictures co-chairman and chief executive Michael Lynton — part of a trove of hundreds of thousands of emails and documents from last year's Sony hack published online by WikiLeaks — Gates asks Lynton for advice on how to handle Affleck's request. On Saturday, PBS said the network did not know of the exchanges between Gates, Sony and Affleck, and wasn't part of editorial decisions made by Gates and his fellow producers.