Drz uh oh

[Trip]

Well I went in the garage today and noticed a small puddle of oil underneath the drz. I would say about 100cc's total lost including residue on the bike. It came from the airbox through the filter. I laid it down once last time I rode it and didn't notice anything wrong with the engine. It was extremely hot that day, probably 100 or so. I drained the oil and there couldn't of been that much lost total. It was still pretty full. Coolant was still full as well.

Anyone have idea where I should start checking.