Try spraying a tiny bit of WD40 on each pulley one at a time and see when it stops.. If it stops squeaking on a pulley, replace that pulley. Also ive heard that pulleys can kinda get glazed over like rotors do, and that alittle bit of light sanding can fix the squeak.
I might also try putting the breaker bar on the idler and relieving a little bit of pressure on the belt and see if it stops the chirp. If it does, it just means the new belt needs to stretch alittle bit i think.
Pulley alignment might also be off. If the above doesnt fix it, id rent a laser aligner and see if a pulley is off.
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