OK, i opened it up. I cannot see any water leaking while pulling espresso, steaming or at the hot water tap or while filling the boiler.
Also i don't see any limescale marks. From what i can see (or cannot see) in the machine, probably simply the manometer is defect...
BTW the manometer is slowly running full of water...i think i have to send it in for a warranty repair
Do you think, it is safe to operate the machine over the weekend?