I am in the same situation. I called GD. They told me it's just the quick disconnect fitting, and they could not just send me the part, as they need it pressured tested after swapping out the disconnect fitting. The tee is not part of the problem unless it's cracked in some way.
I do not plan to take 1/2 a day out of my life to swap out a low pressure $15.00 gas fitting. I plan to order the $14.35 fitting from Amazon and swap it myself.
Tried to find a USA manufactured fitting, but that seems to be impossible. Seems China is the only place that make them......
If anyone has found one manufactured in the USA, please share....
Onward.......