I starting to hear a whining noise too. Not sure if its the same but I recorded and uploaded on youtube. Check link below.
Every time I take my hand off the throttle and let the engine slow the bike I hear this pretty loud whining. once I pull the clutch or gas again stops. Never happened before... Just started last weekend and the bike just turned 3000 miles.
Before you take to dealer, check oil level and add if necessary. You should have already had an oil change. Only saying this so you don't get blamed if oil is too low. Probably gearbox issue, hopefully not oil starvation but I don't think it is.
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