It turns out that the Vibration Damper split apart and the outside part was bouncing around inside the engine compartment. But the serp. belt stayed on.
So apparently not too bad of a problem, just a couple thundered dollars.
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Ruby: 2000 Alero GLS Sedan (totaled and repaired x3) ~120k
Cherry: 2004 Alero GLS Sedan (Final 500 #362) ~63k