Manual & advice Hotpoint Aquarius FDW60?

A friend asked me to look at their Hotpoint Aquarius FDW60 dishwasher which is tripping out the ring MCB and the RCD in a split board. I've measured the phase to earth resistance at the plug top and found a short. From previous experience with similar equipment I suspect a faulty element. Could anyone with more experience provide advice on a likely cause? An engineer's manual and schematic wiring diagram would be of great help with diagnosis.