Its just seeping , will wait till it get worse.

You may like to check that the gearbox breather is free, comes out behind engine at right side along with axle breather. There is no pressure as such in the gearbox casing other than that caused by air and oil expansion as it heats up if the breather is not completely clear a little oil could be forced past the seal. Or it could of course just be a tired seal.
 

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