Sure. After I posted this morning, I received a call-back from the TV guy telling me he wanted to try one more time to fix this issue. I accepted his offer and he was scheduled to return next Wednesday.
The short answer is the TV was not perfectly level. The longer answer is this: This TV fully fills the niche I have for the set. To enable rear connections to be made, I have a 24 inch stool that allows me to turn the set 90 degrees with one end of the set extending into my living room supported by the stool and the other end still on the 24 inch tall cabinet support within the niche. When the repair guy returned the set, he placed it on this stool-niche set-up and we hooked up the connections and viewed the set in this 90 degree orientation and of course we both immediately saw the skew or tilt or whatever it should be termed. After I posted here, I got to wondering if placing the set back to its normal viewing position might matter and the results show it did. I think the stool sitting on a carpeted area resulted in the set being slightly off of perfectly level. Neither the repair guy or I thought to check for levelness as the set appeared fairly level in that position. So, Wednesday appointment canceled, the repair guy is as happy as I am. So, as Emily Litella would say... "Never Mind".