I have a 2004 6.0 with 170,000. Stock other than egr delete. Last night I noticed a small wet spot on the driveway. I believe it to be coolant. It's bubbling out of #7 exhaust manifold. Is this a blown head gasket or worse? I'm just looking for some options before I take it into the shop. The picture is just a screenshot of a video that I couldn't upload for some reason.