Rear derailleur hanger for 2010 Secteur Elite

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I have a Specialized Secteur Elite, 2010 version (triple). Shimano 105. Despite numerous cable tweeks and indexing etc adjustments, the shifting has always been less than ideal. "Maybe the rear hanger is bent?", I thought. I could pay a bike shop to find out or I could do it myself with a Youtube bush mechanic session. If I need a new one, where can I find it? The Specialized tech docs don't seem to list a part number for a hanger for that year's model. I can't find one either on any of the other hanger sites.

Can anybody help?

Specialized Secteur Elite 2010
Shimano 105 triple chainring.
5603 cassette.

Thank you

EDIT: A helpful guy at Specialized UK tells me it is part number 9893-4291. They are £9.99 from Evans