A former youth hockey coach is facing more charges for the alleged sexual assault of six boys.Christopher Prew, 31, of Winthrop, is now facing 10 more indictments returned by an Essex County Grand Jury yesterday for his alleged assault of six boys under the age of 14 in Marblehead and Peabody, Essex District Attorney spokeswoman Carrie Kimball Monahan said.He will be arraigned on the new indictments today in Salem Superior Court.Monahan said the bulk of these assaults allegedly occurred between Jan.