Kevyn: Well, the problem is very simple, anybody who knows the A-B-C's of plumbing could have figured this one out.
Reverend: A scientific explanation for this obvious case of haunting? Really?
Kevyn: I found evidence that some emergency repairs were made to the central system manifolds. It seems that a high-pressure gas line was mistakenly hooked up to the fluid lines. Any time the plumbing cycles fluid, that gas rushes through the system, and it sounds like a voice.
Ghost In the Pipes: YOU ARE ALL DOOMED
Kevyn: See? It's just bubbling noises. Not a voice at all.
Reverend: 'D' is for 'Denial.'