One of the seats won't come out with the seat wrench. Old seat where the square hole could have been mangled by a previous repair attempt (or just too old and crumpled) so the seat wrench wasn't able to grip into it. I'll try a bolt extractor next time. What else would you guys do short of knocking the wall out and replace the whole unit?
I didn't have all the anticipated tools with me, but as it usually goes the tools I needed is the one I didn't bring.