7020 engine oil leak

My brother in law bought a 7020 last month, has a oil leak around one bolt on the oil pan, no obvious cracks in the pan,he has tighten the bolt was not very loose, anyone know of anything to do besides taking pan off and redo the gasket
 
Remove bolt, clean hole a and bolt with brakekleen, and allow to dry, install bolt with sealant on threads.
 
I had the same problem on a 7520 I got brass washers like used on the injection lines, seeled it right up
 

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