hehe, a best buy service tech...yeah...they will simply eye-ball the convergence if they even know how. I should know, I worked at Best Buy for 2 years and have had a broken HD RPTV set (which is still broken....). If he can't resolve the problems, get an ISF tech. The Best Buy guy is simply a repair man who will only fix certain problems, not calibrate your TV. (if he does, wow, you got a nice deal) Good Luck.
***Warning*** Do not look into laser with remaining eye!!