Sorry about that! It drives me crazy when folks don't give the make and model. You caught me!
This is on the 300E. Pressure or whatever won't help much because wherever the leak actually is located is obstructed by all the other accessories in that area.
I thought maybe someone else has dealt with this before. I will be surprised if it is not the water pump, but I sure hate to buy one and change it as an experiment.
Any of your own experiences would be helpful.