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Dishwasher repair, Gebbies Valley Motukarara, slow dripping leak from sump area

Hi. Bosch SMS46GI01A dishwasher leaking, seemingly from sump area in cavity beneath wash cabinet (we have taken panels off and can see the leak). Showing error code 15 as the leak is activating the float sensor at the bottom of the cavity. Dishwasher is just over five years old, suddenly developed this issue. Uncertain of exact cause/source, could be a seal/gasket, have gone as far as we can ourselves diagnosing it. We're in Gebbies Valley, Motukarara. Thanks, Matt.