I have an older Weber gas grill , about 17 years old. It has 3 burners and 13 flavor bars and red lid. It has worked fine until lately. Now it doesn't seem to get as hot as it used to. I cleaned the burners, they looked ok. The only other thing I have changer is the regulator. When the grill was new it had the quick disconnect on the bottle and I changed it to one I bought locally. Could it need a Weber regulator and would new burners help? Thanks