SOUTH LAKE TAHOE — The body of Petaluma resident Alyssa Byrne was found Friday morning in South Lake Tahoe.In a Friday morning press conference, Douglas County Undersheriff Paul Howell said a utility worker in an elevated truck saw Byrne's body behind a high snow bank 10 feet off Pioneer Trail between Al Tahoe Boulevard and Black Bart Avenue about 8:30 a.m.Authorities said her body was just off the roadway about a half mile southwest of Lake Tahoe Community College, where the SnowGlobe Music Festival was held. Her body looked like it had been there for a couple days, Howell said.Officials …