Installed in my campervan is a Thetford C200CS toilet, for some reason the flush is more or less refusing to work, only a dribble of water appearing, no pressure.The water is supplied from the same tank and pump for the bathroom and kitchen which both work fine, having read various forums including Thetfords, could this be the magnetic valve at fault and If so where is it? As anyone had a similar problem The Thetford toilet is I think still under warranty but if easy fix would save a bit of bother leaving in somewhere.