I don't know the service menu for the toshiba.
But about the geometry, hmmm...i think it can be fix, but don't expect 100% perfect geometry, because's that's not possible, unless its a display like fixed pixel displays (plasma, lcd, lcos, dlp)...
So, again, geometry can be fix up nice on CRT that it's acceptable for many users like me if there's a slight off gemeotry pattern like.
But it sounds like repair tech doesn't want to spend time adjusting it which can be time consuming i guess if you want to make the best out of it and he probably isn't well train in that area to adjust the geometry. So, he just not take the risk which I think he did the right decision if he doesn't know what he's doing. But i dislike that he wasn't honest when he say it can't be fix....