Primary fluid leaking at derby cover

Got home from Shark Week V, 3000 miles on fluid change. No evidence of a leak through the whole trip. Bike was washed and parked for the last two days while I was working, got home this afternoon to this....



It appears to be leaking from the derby cover, using a paper gasket (new style rubber doesn't fit this derby cover).

Question... Going to replace the gasket and retorque the screws but is there anything else I need to pay attention to? Should I drain the primary and replace the fluid again with the correct amount?