One drawer leaks can cause this problem. If you don't fix it. One day it will turn on the pumps from both units without any one touching them since the floor sensor at the bottom housing detects water and it will run for ever until you unplug the power cord. This dishwasher is a state of art in design and replacing parts is very simple once a person has enough understanding of its mechanism. If the tech fail to find the problem then he is not qualified to touch this dishwasher. When there is a leak, it is a problem with the lid seal from the top not closing down tightly so during the wash cycle, water shoot up and leaks through the top opening then collecting on the bottom housing of each unit. Let say the top draw is leak, so the bottom housing of top draw if full of water then it overflows to the bottom drawer unit then the floor. Here is the idea of how it happens. The top lid is pulled down by 2 actuators from both sides at first start. That is why you can hear the motor noise turning on at the beginning of the wash cycle. That is the noise from the actuators. If the actuators are bad. only one side works then the lid can not be sealed properly there is a leak. If bothe of actuators are week the gear worn out so they can not hold the lid down during the wash cycle then it can cause a leak. You can pull each tube out and access from the left side at the bottom to touch the bottom housing to fell the wetness. Put in tower to dry them out. If there is a weteness from the bottom housing upper tube it doesn't mean the bottom drawers is leaking. It is wet just because the top is leaking. However you have to dry the bottom in order to continue use the bottom dryer. If you ignore my advice then your circuit board at the bottom housing of lower drawer will be damaged and it is not cheap. With the information that I provided you can interview a tech claiming know about the this type of dishwasher before letting him coming into your house. Good luck.
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