for what it's worth, i tried a technique listed on the "search" on this site, i.e., leaving the master cylinder to vent overnight on the chance that someting in my (vacuum) flushing procedure might have left an air bubble somewhere. I have read some threads about bleeding the ABS "port" but can't find one.
So far (2 days and 70 miles) no warning light!
Will keep you posted!

Best,

Frank