Yes buzzlightyear - RHS side of frame under the tank.
Offroadtoad - You do need to remove the tank but it's not that difficult if it's empty(ish). Just be careful when disconnecting the fuel hose from the pump not to snap the plastic pipe off!! - the connector can be stiff. In the absence of any other pics at the mo, hopefully the attached one make's it a bit clearer where to look under the tank. (Airbox to left of pic, engine/valve inspection cover to the right with the throttle assembly & FI w/lead in the middle).
As for any problems/issues I've encountered over my current 53,000 miles, they've pretty much already been discussed (cush drive rubbers, seat). Rear disc will probably need replacing soon.
The high mileage is due to me being a courier and fortunately mostly due to prolonged steady/smooth riding (err - mostly) up the A3 to London from Guildford with the occasional distance work. Would be interesting to compare my engine sound/vibes with a low mileage Tenere to see if things are starting to get too loose now though. (Single cylinder paranoia setting in).
There is one particular issue that has become ever more prevalent though - the lack of any alternative bike that suits me! Being used to a trail bike with a consistent 60-65 mpg regardless of riding environment (within reason) kinda limits the choice!!
Until Suzuki wake up and smell the roses!! Fuel injected DR650/750/800????!!!
BTW, all's well so far since sorting my FI lead. Managed 240 miles before F-trip came on once last week!