Check this thread:
http://forums.pelicanparts.com/porsche-996-997-991-forum/841557-1999-c4-oil-cooler.html
Post #2 in the other thread that you started about this has a link where it did turn out to be the AOS.
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2013 991.1 Carrera S Cab
2004 996 Turbo CAB X50 sold
2003 996 cab 6 speed Sold
1972 RS 3.2 twin plug short stroke crank fire, roll bar, sold
DE instructor since 1985
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