IMHO the most likely cause of this leak is the soap dispenser hose which is usually corrigated attached to the bottom of the soap dish leading to the top of the external drum.
To check this. Turn the power off for safety reasons.
Remove the top from the washing machine and inspect the soap dispenser hose. The tell tale signs are wetness and white soap powder deposits and water mark streaks going round the drum starting at the bottom of the soap dispenser hose. The hose often splits around one of the springy type corrigations in the hose.
Hope this helps!
TALBERT
October 2006