Yes they pulled the cover. If they didn't replace the rubber gasket, but only used silicon rubber, then there is a real possible chance it will leak. Mine did. I reccommend replacing it but it cost ~$40.00. I cleaned up the two layers of silicon rubber very good. Took two hours. The bolts go through a sleeve that prevents too much tightening, but don't over do it. My leak ruin my spark plugs wires.