(Tualatin, OR)  --  Investigators will try to find out what caused a fire that heavily damaged a Tualatin restaurant.  Firefighters responded shortly before midnight last night to the blaze at Miller's Homestead Restaurant on McEwan Road, where they found smoke coming from the roof of the building.  The fire was deemed under control around one a.m., and no injuries were reported.  The owner of the restaurant says the goal is to rebuild and reopen as soon as possible.