Bosch Classixx Conditioner drawer retaining water

[BazzaS]

I've a Classixx washing machine. Of late, at the end of the washing cycle there's been water still in the conditioner compartment of the drawer - about 3 quarters full.
Note the conditioner has been flushed out - it is just water remaining.
Now, if I top up the water left in the drawer it initiates the syphon action and the drawer empties.
I've thoroughly cleaned the drawer and its syphon tube; ricked out the overhead inlet holes of gunge with a piece of wire, thoroughly cleaned the overhead area with toothbrush & soapy water. All to no avail.
It seems to me that there's not enough water getting into the compartment to flush it.

Can anyone please advise what can cause this ? And what I can do about it
(It doesn't affect the actual washing so I can live with it - but it shouldn't happen)
Thanks

 

[jj4091]

Leaking inlet valve?

 

[BazzaS]

Thanks JJ but inlet valve ok.