Further investigation has revealed that the oil leak is from the left hand side of the gear box where there is a metal strip with a brass hinge connected to an electrical cable leading into the cabin.
The leak point is from a metal plug inserted into the side of the box locating the metal strip.the plug is serrated round steel with a flat on it.
Anyone tell me what this is,can I screw it or hammer it in?
Gearbox is a 722.6