[Jamesb]

I guess the key is, how cold did it get? It usually has to be a hard freeze to expand enough to make PVC break. And maybe it was a small drip before the freeze? Anyway, unfortunately you will have to pull down the corrugated material, which is a pain. The grey water pipe goes right beside the black tank pipe. One thing to check first is that fabulous quality made toilet in the half bath. It will start leaking at the base eventually. As they say, it’s not if, it is when it will start leaking. Look close at the base that sits on the floor and check for moisture.