(Portland, OR)  --  An investigation is under way into the discovery of a body inside a burned home in Corbett.  Firefighters responded to the home on East Woodard Road near Troutdale early Tuesday morning to find a fully involved fire they say took 15 minutes to put out.  Fire officials initially said they didn't find any victims, but the Multnomah County Sheriff's Office announced yesterday that crews found human remains during a routine investigation to determine the cause of the fire.