Well, I have isolated a p/s leak at the high pressure connection to the pump. Thought I might try to tighten the connection but do not want to break anything.
suggest you buy a single hex open ring spanner, called a flare nut spanner, using this you can tighten the coupling tighter than with a regular spanner. i bought a cheap flarenut spanner and cut some length off so it would fit in the space to tighten mine. seems to be a common problem with 190e's. check for leaks after tightening to see if hose end or coupling has a crack causing the leak, hjopefully you will get lucky and just nip up the nut to fix the leak