Leak in Final Gear Area

I haven't ridden my Nomad in a week and a half.Rode about 250 miles, two up, in 100+ heat Saturday before last. Tonight, I noticed two oily spots close to the rear axle area. Upon inspection, I could see the leak is coming from around the bolt that bolts the bottom of the left shock to the Final Gear Case. The Final Gear oil was changed at 567 miles, and I have not had any problems at all, until now. I have about 7,800 miles on my Nomad at present. I am still in warranty. Should I take it to the dealer? Or should I try to tighten the bolt at the bottom of the left shock ? Any ideas ?