Small leak on side of transmission

Hi All. On my 560 sec transmission , I noticed a slight leak through this orifice. Not sure what it is and if seal /o ring can be replaced. see foto. will appreciate some suggestions on how I can resolve. regards c

Hi All.

On my 560 sec transmission , I noticed a slight leak through this orifice. Not sure what it is and if seal /o ring can be replaced. see foto.

will appreciate some suggestions on how I can resolve.

regards
c

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