Well, finally popped my tupperware-removal cherry and partially disrobed the beast. It's a 2003 - are the QDs still plastic for '03? They look like metal to me. Says 'CDC" on them.
In any case - ran the bike, rev'd it, idled it, long enough for the fan to kick in.
Nothing. No smell, no drip, no spray.
Tracing through the inside dust, it almost seems to come from the fuel filler area up top. I just blundered across another post that suggests the gas-cap seal as a possible culprit.
I'm also thinking the overflow tube - even though I don't ride aggresively, I do have some serious bumps on the way to work.
Just had another look - open mind once I looked past the QD's.
Looks like a fair bit of leaking around the...uhm...Immersion Tube Sensor. That's the big round metal cap, 6 allen-screws, and a wire connector.
If that's the culprit and I remove the unit to replace that gasket (if such is possible) the damn thing needs to be re-calibrated. GAH!!!
(Pic stolen from a different Beemer, but looks very simmilar)