Thanks all for the advice and suggestions. And, now for the rest of the story. Trying to talk with someone at Kwikee I found to be impossible. Even dealers in their products have to submit orders via fax When I attempted to contact someone at corporate, The message stated that the office was closed but their hours were 8-5 Eastern time (I found at 10:30 Eastern time). Bottom line, I found getting hold of any person at Kwikee or one of their umbrella corporations impossible.
Second chapter in the story: I went to Camping World and got the new gate valve, no problem there. While there I asked their techs and parts people about the issue I was/am having with the slideout tray. They had no clue as to how to remove it and stated that the only way they can contact Kwikee is through one of their distributors.
Conclusion: new gate valve has been installed, the leak is repaired and I am enjoying a well-deserved Scotch (even if I do say so myself!).
Again, thanks for all the advice and suggestions.
Bill