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Regarding the noise, when I had my pulley replaced, I remember the tech mentioning that the squeak sound comes from the worn spring in the tensioner arm. If the belt runs slightly misaligned, the tensioner spring can cause a squeak from the vibrations of the belt wobbling things a bit. I initially thought it may be the bearing (OFHG Leak) or belt but my noise was from the tensioner spring.
In my case this was very faint and only noticeable when parked in a garage idling.
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