Buzzing vibration - advice?

[stopintime]

I notice a buzzing vibration through my left footpeg.
No audible sound.
Higher pitch (a few bees dressed in armor) than the engine - I have the same vibration rolling with the engine shut off.
It's only noticeable around 40mph.
Doesn't change with/without brakes applied.
The rear wheel/rim center is slightly warmer than the front. (right side)
Shook the wheel sideways, couldn't notice any freeplay.

My bike is just out of it's 24,000km service (15,000 miles?).

I guess part of that was checking the bearings, but they might have missed it

Your vote for possible issue, please.....

[stopintime]

Anyone?

[Speeddog]

Chain tension?

Chain rubbing block on swingarm?

[ducpainter]

I have an acquaintance that used to own an M750 that complained of the same issue after a service...

it never got figured out.

[DarkStaR]

Chain tension?

Chain rubbing block on swingarm?

+1

[wiggy_nz]

Loosen the chain a bit and try again.  If the chain is too tight it will cause a vibration through the foot rest/s.

[stopintime]

Thanks guys 

I'll try the chain thing and see what happens.
Sounds logical since it's only a left side vibration.

[stopintime]

Yes, the chain was very tight. Almost no freeplay with me on the bike.

The head tech at my shop couldn't help himself - the poor junior tech who serviced my bike just a couple of weeks earlier had to crawl into a corner.

Another lesson for me though: I'm going to equip my tool box better, upgrade my courage/knowledge and do more work on the bike myself

[CairnsDuc]

I always set mice with about 40mm of slack in it, a bit more than what Ducati suggest, but I would rather replace a chain that has a little to much wear from being just slightly loose, than replace a bearing in the Casing or have to replace the Hub.
I get in the habit of checking my Chain tension every 500 k's