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If you are referring to where the selector shaft enters the gera box on the tail housing, I’m afraid you will find the dealer (while over priced) is correct: The gear box has to be removed and the entire tail housing must be replaced.
The shaft passes thru a bronze bushing, which has worn out of round, causing the leak (not uncommon). The problem is that the bushing is not replaceable due to the fact that it is pressed into the housing blind, and then machined in place to create the opening for the shaft to pass thru. Replacing the outer seal will only stop the leak temporarily; it will come back unless the bushing is replaced. As no one outside the OEM gearbox supplier has the correct tooling to do this, the tail housing must be replaced, which means pulling and disassembling the gearbox……
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