Vetus WCS2 filling issue

[Floatymark]

Hi. 
My 2006 Vetus WCS2 loo has decided it won’t stop filling with water once the eco or full flush buttons are pressed. The PCB is the likely culprit but new ones are pricey. 
Is anyone breaking a WCS2 for spares and has a pcb? 
Or any other thoughts very welcome. 
Thanks. 

[Iain_S]

The solenoid valves on most boat loos are a bit of a weak point, and are prone to leak when nominally closed. If the thing flushes, with more water flowing when the flush button is pressed, it would suggest that the valve is trying to do its thing, under instruction from the pcb, and that it's the valve that's faulty.

[Floatymark]

Thanks Iain. That’s very helpful.