My compressor was also worked on, but here's the story. Brought it in for it's first oil change, they did a 27 point inspection (A/C was not part of it) I got it back and the A/C line caps were missing, they were there before. but not anymore, It soon developed a noise after. After some time it was low on fluid.
So they topped it up and replaced the belt. they also tightened the compressor because it was loose...
Got it back still made the noise, they replaced the belt again! it has since been kind of alright but I still fell something is wrong, The amount of drag I get from it seems more then it should be, but I'm not sure.
But no matter what when it was running and I had it in Drive or Reverse with my foot on the brake, it sounded like a diesel engine at idle.
That phaser problem is kind of worrying. I'll have to listen for that rattle at cold start