Okay so I did see water inlet valve when I took off the bottom plate and it was on the front left side. The water seems to be coming out on the right side of the dishwasher so I don't think it is that.
I like your suggestion though about turning the water off after a run and see what happens.
It doesn't seem like it is actually leaking anything while it's running, so maybe that's because water is actually moving through the drain hose and not just sitting there, so it's not able to do it's slow leak thing?
The relative amount of time the dishwasher is running is small versus the time that you aren't using it. However, when you are using it, the water being pumped is heated water, which in turn heats and expands everything and could be stopping the leak. After the cycle ends, everything then contracts again as the dishwasher (and any remaining water) cools and the leak (wherever it is) could likely resume when it is cold.
You said you replaced the door seal. Did you replace BOTH of them? Bosch (and most other dishwashers) actually have two seals -- a main three-sided door seal (it runs up the side of the door, across the top, and down the other side) and a lower door seal (which runs along the bottom of the tub at the door opening).
If the leak is further back on the right side, you'd have to look at the pump seal, the pump housing (where the pump is installed), and drain hose to see if any of them are leaking. The drain hose always has water in it whether the dishwasher is running or not, so it is possible it might only leak when the water cools down after a cycle. I'd consider the possibility that you have a leak or fracture in the wash tub itself less likely as that type of leak would tend to leak when running (when it has water in the bottom) and not so much between uses (when it has been drained, unless water has a place to collect and drip to the floor). Similarly, the flow-through heating element on most Bosch dishwashers is located on the left mid or left back side, so I wouldn't think it would cause a leak on the right side.
And, I had two other thoughts.
Firstly, if you open your dishwasher door up and look at the inside of the tub, there will be a vent (usually round, with a gray plastic cover) in there probably 8-12 inches above the floor of the tub on either the left or right sidewall towards the back. The next time you run a cycle, make absolutely sure nothing is covering or laying against that vent. If the vent is covered, you can get a condensation leak under the dishwasher due to the design of this vent system. Covering it up can also adversely affect the drying system as well.
Next, do you use dishwasher pods, or other detergent? Some Bosh dishwashers have issues with detergents (mainly pods) that create too many suds. Over time, the suds can actually build up and displace the door and/or pump seals and cause leaks. Sometimes, simply literally changing the dishwasher detergent you use is sufficient to stop the leaking in this instance.
Finally, is this a small leak, or is it a substantial one? There shouldn't be enough water in the dishwasher between cycles (other than in the drain hose) to cause a substantial leak. The only exception would be the drain hose, which does hold extra water.
EDIT: I sent you a PM regarding a Bosch technical platform document I have in PDF format. It may or may not help you with your dishwasher, but I can email it to you if you want it.
