The fire at Petrie Hall at Heritage University will get a full investigation today. After days of waiting to find the source and ignition point,  fire investigators will get their chance this week.  Deputy Fire Marshall Ron Rutherford says his team won't go onto the site until later today.  Rutherford says they needed to let the building cool naturally without any more water to keep the burn patterns intact, which is one of the reasons the investigation hasn't truly started.  Inspectors will go in today to remove components from the building to trace the source point of the fire.