Tobin,

Sorry I was obscure, but that's just what I meant. There are two critical (at
least) failure points with the pressure relief valve: gummy deposits from
poor maintainence/overheating/coolant leak into oil; and debris from a engine
or bearing destruction event. Often by the time the part gets into my grubby
hands, the history has been lost. As you experienced, inspecting, cleaning or
rebuilding that part has such an overhead attached, one is likely to just use
it again.

Frank