Water leak - 50% goes into waste

DELONGHI ECAM22110SB Magnifica, about 8 years old and used almost daily, at home.
For 4 to 6 weeks it has leaked some water, not just into the red receptacle. Lately, the black container where coffee pellets are collected has had water, which last 2.5 days has been increasing to be half the volume of a single cup coffee (RHS, single cup button) .

Regular interior clean with solution etc, but for about a year I haven't cleaned the grinding mechanism, RHS behind the water tank, but I have not got further inside to check where the leak is occurring.
Any ideas, diagrams? I would like to fix it rather than replace a good machine