The 340 is out....again.....

Gentlemen, thank you all for your input. I am the first to admit that I do not have the technical expertise that I'd like to have, and in this area I appreciate any and all relevant input. FYI, I've taken your comments to my garage guys in printed format and have asked them to review your opinions as to what has and is going wrong. For all I know, they missed something simple and by reading your comments the light bulb may go off and they'll realize where things went south.
I'll keep you all posted.