"Robert..... Hopefully you hav
"Robert..... Hopefully you have the proper service manual as there are various seals in that lower unit and space here would not permit the full instructions for all of them.
Pertaining to your question.... anything is easy if one knows exactly what they're doing and has the proper tools to do so.
If you know exactly where the leak is, which seal it is, let us know. If not, drain the gearlube, then replace one of the screws (fill or drain). Apply 7 to 12 psi of air to the remaining hole. The leak should become evident by sight or sound."