Three things to look for, locking ring under salt cap is tight, check internal hose feed pipe going from wash pump to top spray arm, if ok proberly a slow leak from wash pump. Sorry to disapoint you but you AEG is a Electrolux,not good old german quality, looks the same but italian parts in it . but on the bright side parts are cheaper than AEG.
asuds@hotmail.co.uk, March 2008