TVWBB 1-Star Olympian
Mark: Looks like you have all the bases covered.
I agree. Rare to have an issue there. Mist be the grill hose/connector. Careful.Are you talking about the gas hose/regulator and a 20 lb propane tank? It should seal fairly easily. If it isn't the tank, then it is the hose. I would contact Weber about getting a new hose. I don't think you will have any problem getting them to send you one after you explain as above.
If not, you can replace it for under $10 anyway. https://www.homedepot.com/p/GASONE-3-ft-Gas-One-Propane-Regulator-and-Hose-2106/310727271