No wire in that cover.
There are 2 different cover arrangements for the "G" CTL. First thing to try is 2 heal bars. If that does not work then try one of these. If the oil level plugs are in the cover, you could make a slide hammer adapter (2 of them) to pop the cover off. With the oil plugs in the gear case housing, I have used air pressure regulated down to 5 - 10 psi. Wrap something around the cover somehow to keep it contained (do this for safety). Do not stand in front of it when applying air. Better if you had an adapter in the case and apply air from a distance. Also, with either design, there is a thrust washer on the end of the sun gear (or inside the center of the cover). Don't lose that.