Hi All,
Thanks for the great advice. After manually shifting the derailleur I found that I could not get past the 7th sprocket, even with the high limit screw backed out completely. I'm assuming the derailleur is defective which probably occurred last year during a spill in rain (I replaced the bent hanger). All this time I never bothered fixing this b/c I assumed the shifting was related to the limit screw settings and I sort of liked not having the ability to get in the granny gears on the hills along my commute route (made for a better workout). Anyhoo, I replaced with a spare Ultegra derailleur and all is well again. Thanks again for all the help, and the video.