There was a check engine light in my 2010 Subaru Legacy gt and I had zero compression in cylinder 3. Found a burnt valve was causing the cylinder 3 misfire. These seem to be the common burnt valve symptoms. I pulled the ej25 motor out of the car and now I'm rebuilding the head. It was in good enough shape that having the Subaru head replaced wasn’t necessary. Unfortunately there is a lot of work involved with burnt valve repair. I had the ej25 head fixed at the machine shop and I install new valves. All the new valves are lapped into place and then I do a leak down test. Valve lapping takes a lot of patience. I also measure the valve lash and get that into spec.