P0327 is typically caused by electronic problem....usually bad connection or sensor. It's unlikely boiling water would trigger this code. More likely the blown lower hose jarred wiring loose, baked it, or caused a connection problem.

I haven't changed the stat on my VX but would be shocked if the intake needed to be pulled to swap it out....and yes, failing stats can be intermittent -- making it a good next step. Hopefully, it's not a head gasket....which can also be intermittent in the early stages.