Here's what Bosch has to say about leaks:
Water seldom leaks out of bottom of dishwasher doors. Usually itís a customer or installation issue. Occasionally temporary blockages of condensation tubes by air pockets (from standing water in loops) or kinks in tubes causes leaking. Pressure builds in tanks, blowing water past lower door seals (usually at start of cycles). Draining condensation tubes and straightening out kinks solves these occasional problems.
Service Tips -- Water Leaking Past Doors
Checklist if water leaks past doors:
Make sure condensation tubes are inserted into bases, not connected to drains or air gaps.
Clear and drain condensation tubes, including debris in bases.
Re-drill wood doors to make them square.
Straighten kinks in condensation tubes.Educate customer on oversudsing(from too much detergent/rinse-aid or overly soft water)
Level dishwasher beforeattaching undercounterbrackets.
Replace damaged door seals, including replacements cut too short.
Refill lower racks overfilled with dishes.
Move flexible cutting boards to left side of dishwasher
I will provide you a copy of the Bosch Dishwasher Service Guide for your perusal...hopefully it will lead you to a conclusion. The advice given by JW is also worth heeding, as a visual inspection of the lower area during the wash cycle with the access panel removed may lead you to where the leak originates.Bosch Dishwasher Service Manual