Welp. If it helps any, now is the time to be finding this. A million times over, now is the time.
Yep I agree! I’m going to blind flange off the faces of the main drains and pressure test the entire system once I’m done. I’m just worried water froze somewhere else and compromised piping in the main drain system. I poured a bunch of coolant down before I plugged the drains, but you really never know. Pressure tests don’t lie!