After studying all the great advice, videos and pictures from this forum, I dove into the problem this weekend. The clutch cable had broken inside the clutch actuator (not the lever). With the great support from many of you and quick shipment of parts from bigdogpartsking and wildsteedworx we are back on the road.
I prepped on Friday by applying penetration fluid to the exhaust nuts. Then on Saturday followed the guidance and removed the exhaust, opened the actuator and found the culprit (picture below of ferrule with broken end of cable). I then replaced the clutch cable, and clutch pushrod and inner actuator gasket. Greased up everything with high-temp grease, and put it back together. (I also polished up a few spots I couldn't reach prior to removing the exhaust.) After a couple of short rides it seems to be ok!
Thanks again for all the guidance and advice. Honestly, this forum and great parts support is why I chose a Big Dog vs the other brands out there as I am NOT a mechanic. You guys rock! A new picture of the pup at the (dog) park is attached.
Dave
2006 Mastiff