I'm sorry if bumping threads is against the rules (I didn't see a ruleset anywhere) -- but I'm likely going to tackle this over the weekend on my 03 GT. Is rocking the motor forward necessary?

A bit of info -- I took it to the shop because of a belt squeak. They were "positive" it was the belt tensioner, so I replaced it. It wasn't. Looking down while the engine is running the only pulley that rocks back and forth is the PS pulley, leading me to think the bearings are shot. It's a intermittent squeak, not a constant one. My thought is to remove the belt then check for play in that and the A/C unit (the alternator is fine). Thoughts? I've never done a PS pump before, and I don't want to replace the wrong part yet again. That was a 100.00 mistake that I should have thought of sooner.