Back again - just removed wheel , caliper and rotor . No foreign objects/cr#p, but hub and inside of rotor coated in a fair amount of grease . Cleaned it all up and - not really surprised - noise is still there .

Looks like I'll be pulling the axle shaft out . May be it is the spacer, or a dry bearing - but it does not sound like the rumble/whir you get with a shot bearing. More later and thanks for the advice .