Slow electrical leak???

["Robert Dodd" <rdodd@bellatlantic.net>]

Well, here's a new one. Bought a used 90S. Had it for a week before the wife
left the radio on and killed the battery (sat for a few days). Battery
appeared to be original so I replaced it with new. Recently, car sat for a
week and when I went to start it up, dead battery!!!! Well, nothing had been
left on this time. Jump started it, drove around for awhile, seemed to be
ok. Let the care sit for another 5 days and the battery is dead again.
Nothing left on that might have drained the battery that I could tell. Any
thoughts on possible causes? The battery checks O.K. I'm afraid this is one
of those problems that will plague me trying to figure it out, and I have
little confidence if local shops with a problem such as this. Common problem
and easy fix?