All the belts are located in a cluster together so it's hard to tell which one it is. Check your accessory belt tensions first. When I changed my belts sometimes I would get a squeal when I turned on AC so it was kinda obvious which one was at fault. If you need to figure out how much 22lbf (lb force, not lb-ft) is, go put one or two fingers from each hand on a scale (to make it read correctly) and push til it reads 44 lbs (to make up for pushing down with two hands instead of just one that you need for checking the belt). I think you'll find it takes a good bit of force...at least it seemed like that to me.
Deflection Method
Inspection
Apply a force of 98 N (10 kgf, 22 lbf), and measure the deflection at the mid point (A) between the alternator and crankshaft pulley. If the belt is worn or damaged, replace it. If the belt needs adjustment, go to step 2.
Deflection:
Used Belt:
7.0-9.0 mm (0.28-0.35 in.)
New Belt:
4.0-6.0 mm (0.16-0.24 in.)
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Deflection Method
Inspection
Apply a force of 98 N (10 kgf, 22 lbf) and measure the deflection between the power steering pump pulley (A) and the crankshaft pulley (B). If the belt is worn or damaged, replace it.
Deflection:
Used Belt:
13.0-16.0 mm (0.51-0.63 in.)
New Belt:
11.0-12.5 mm (0.43-0.49 in.)