Can someone help me adjust the geometry on my CTC-186/7 ?

[kcollins4]

Hi guys,
I'm out of my element adjusting a TV. Spend all my time in the vintage audio forums. We recently bought a used Sony 34" XBR (2007 model), and moved our old GE CTC-186 to the bedroom. I was going to adjust the focus and brightness, but they're really pretty good. However, the geometry of the picture is "off". The bottom corners are a bit stretched out, cutting off the left and right letters or numbers on the screen. Also, the vertical size has grown enough that a sentence at the top or bottom of the screen is only partly visible.

After poking around the web, I've found how to access the service menu, but have found no mention of what values and parameters I should enter to adjust geometry. I realize playing with the service menu is dangerous, but I'm confident with some AK help, I can have a better picture. Any advice appreciated.
Thanks