Tearing into a 2003 1.8t. P.O. had head completely redone after tb failure, screwed up timing and bent the new valves before the car ever ran, so after pulling the head noticed what seems to me like a lot of carbon buildup on the #1 cylinder wall. Is mostly at the top passenger side section of the cylinder but there is some less significant buildup in other spots. The other three cylinder walls are spotless. Is this something that can be cleaned up good and reassembled or is there anything else that can be done to address it while the head is off? Is this indicative of a bad or gunked up ring, or is there a way to test the ring with the head off?