After doing what Sam said you will then need to find out why it leaked. It could be either drawer that is leaking. Run only one drawer for a few days. If no leaks then run only the other drawer and see if that leaks. Once you know which one then you will have to work out why it leaks.
Mk
November 2010
This is due to flood switch turning on at the base of the dishwasher housing. The drawer is leaking water which collects at the base. Take the bottom drawer out and dry the base with towels and hair dryer.
Make sure the power chord is taken out when working on the dishwasher.
sam
November 2010
I can answer this question...
how can i fix dishwaher, fischer & paykel model dd603?
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Try fixfault.com to fix dishwashers.