Just had the annual service done. Apparently the exhaust valves are functioning correctly.
So, good news is no sticking after having had fuse 15 removed for several months.
The exhaust still sounds great with the fuse replaced, perhaps with a less highway droning.
My subjective impression FWIW is that the exhaust actually sounds better than it did before the fuse was removed in the first place.
Lastly, I'd like to give a shout out to Boston Jaguar, my local dealer for their great service department!!