Took my 40D in for the 50hr service and apparently I misunderstood what the fix is, or at least how they were going to install it. Apparently, they now are going to take out the leaking fitting and put in one that not only seals better but also has a shutoff on it, and then reconnect the hose. The rest of the setup remains the same, so you can still drain the block and radiator at the same time. The new fitting looks like a plug with a threaded hole in it and inserted in that appears to be a standard radiator/air tank drain fitting. The old hose would slide onto this drain fitting and complete the circuit, but because this new fitting acts also as a valve, it also fixes the cold running engine thermostat bypass problem. I already had installed a valve in the line coming from the radiator so I really didn't need this second valve, but hey, if it works, maybe I'll eliminate the one I put in sometime down the road.