I looked in that area, there was a lot of debris but almost all of it blew out with a compressor. There was a little bit of stuff on the hard pipe, but it wiped off and was mostly just dust. The block has a little bit of stuff stuck to it that wasn't removed with compressed air, but no real signs of a leak here.
The auto parts store rents them locally so I'll go grab one and see what happens. I don't think it's likely to be head gaskets as I don't have any of the other symptoms I've had in the past.