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Hi,
It could also be any belt-driven ancillary (PS Pump, AC Compressor, Alternator) with a bearing going dry/bad. Similarly, either of the Idler/Tensioner pulleys as well. The secondary Air pump can also make noise at start up. The one on my Esprit goes off every cold start for a few hundred revs until it warms and the vanes expand, but this is usually more of a chirp than a squeal. Hope this helps...
Happy Motoring!... Jim'99
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