Any ideas on this noisy 2009 Corolla?

At least it doesn't seem to have the VVT actuator startup rattle.

The belt on this is tightened the old-fashioned way, at the alternator bracket. The only moving pulleys should be the alternator, water pump, and A/C.
 
They said they replaced the water pump and also installed a new serpentine belt. Whatever was making the noise must have been replaced because that racket is gone and sounds 100% better and is driving pretty smooth now.
 
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