Or, you could simply remove the radiator from the front (and replace the T-stat and O-ring while your in there) do a coolant flush, gently snug and tighten all the loose coolant hoses that your going to find, and pour a cup of simple green, or your favorite degreaser into a long funnel (or a short funnel with a piece of clear tubing attached) and pour a gallon of hot water into the V and watch it come pouring out the square hole until its clean. That's if you wanted to. No need what so ever to remove the air box, or throttle bodies
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However, the first things I would check would be simple (free) stuff first....like, is the O-ring still on the Oil filer cap? They tend to tall off without people noticing them.
When you did the oil change, did you over fill the oil level? Is the oil coming our your crankcase breather hose (into the airbox, and then draining into the V?)
Remove the plastic, then pull off both the cylinder head cover pieces (grey plastic) then remove the bolts holding the coils to the frame, you can now look straight down behind the cylinders to see if any of the rubber skirt is pinched, causing your leak(s)?
Standing by the White Courtesy Phone if needed.