Mercedes Sprinter NCV3 Roof Leak Fixed!

After putting some thought into the possible solutions to the notorious NCV3 roof leak problem, this solutions seems to be the most effective and serviceable.
Basically, silicone around the perimeter of the forward cover of the factory NCV3 A/C system. I recommend doing this after a fully drying out entire area around and under the A/C unit to avoid trapping moisture under the cover.