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Two things. One, when the PS pump bearing goes, it whines pretty loudly. An easy way to test the bearing is to take off the PS belt and rotate the pump pulley back and forth by hand and listen for any noise. The other is when the reservior's O-ring is shot, it will allow air to get in the system, causing more whining, especialy on cold mornings. Your symptoms sound more like the second problem. Don't bother getting the exact replacement O-ring from Subaru, it will flatten again and you'll have the same problem in a couple of more years depending on your climate. Just get an O-ring that's twice as thick and be done with it. If that doesn't alleviate the noise, then you'll have to do a rebuild, which isn't hard or expensive, but you have to be careful.
KuoH
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