HARLEY EXPERIENCE 2006 Electraglide Standard

I own a 2006 Electraglide Standard with 22K on the odometer. I've had a persistant engine noise from the right side like a coffee grinder grinding coffee. Both dealers in my area have not expressed enough interest in trying to find the problem. Coincidentally my wife's 2003 Dyna (15K miles) makes the same noise. I think it's timing chain or tensioners, or bearings or bearings in the trans. The noise drives me nuts. I found an independent mechanic willing to take a closer look. Dealer skill level has been disappointing and over expensive. I'm not sure if I have a bad egg or just poor customer service from my dealers. Any help is appreciated. Dale