Spinning my wheels on engine squeal

[fishski]

First post. Thanks in advance.

First thing I did was a search to see if I can find any specific answers, nothing specific but all helpful.

I have an 01 S with 18k, original owner. Just did a bunch of work on the car (new plugs, filters, oil filler tube, AOS, magnetic oil plug, oil change, etc. after 12 years of just changing the oil.

I've had a squeal coming from the engine area for the last year, maybe two. Wasn't horrible but I noticed it especially at the end of a rev cycle with RPM's north of 3k.

I checked original belt and it was in good condition but I proactively changed it first to see if it would be a quick fix. Not. Changed upper and lower belt pulleys, alt. pulley and the noise seems to be getting worse. I have the belt tensioner on it's way.

Waiting to see if BT makes any difference.

Next, which I am hoping I don't have to will be alt and water pump.

Any idea's?