Yes indeed, Mercedes has run the line between the cross-member and the engine (upper oil pan).

I imagine with the limited clearance in there, that the line has rubbed a small leak in it over the years from engine vibration. They could have easily run that line along the back of the cross-member. Anyone know what that section of this line looks like as it passes under the engine along the cross-member? Wondering if there is a chance that there is a coupling under there that just needs tightening or if it is straight line...guessing the latter.

I pretty much need to remove the engine or lift it, to properly remove the rubber buffers that hold the line to the TOP of the cross-member to properly install a new line???
Since there is no way I am going to all that trouble....I guess I need to figure out a suitable way to bypass that section that runs under the engine.
The plus side to this if there is any is that I can easily get to the line fairly close to where it snakes down under on each side of the engine...to cut into the line...to splice in the bypass section to get from the passenger side back to the tank.

My question now is.....where to run the new bypass section of line....and what to use in place of the steel line that will be bypassed?

Can I use rubber hose since it is just a return line?
I am thinking I may just route it along the rad support somehow?
That will require some extra travel length to this circuit.
Will it be a long enough bypass to affect the operation of the system? I would think that I would be adding about 4 feet to route it differently?

Anyone else come across this problem?
Thanks.