It looks like the turnover among top management at UPN is continuing. Nobody’s talking on the record yet, but it appears that UPN senior executive VP Len Grossi is preparing to ankle his post after three years with the netlet. Sources say Grossi is considering a move out of concern that some of his administrative duties will be usurped under the weblet’s new regime, headed by former Disney TV exec Dean Valentine, who replaced Lucie Salhany as UPN prexy and CEO in September. Sources stressed that the situation is basically amicable and that Grossi is not being forced out. A UPN spokeswoman declined to comment.