On my Thermador DW, I first take off the kick panel at bottom front.
Then remove 2 screws each side on front jamb, behind black gasket. Gently pull side panels off by lifting upwards and outwards. this gives you access to the under tray where all the components and wiring is. The door skin comes off by removing screws on inside edges of door. The bottom tray comes loose by removing two screws each side at front bottom (behind kick panel) and one screw each side on back at bottom of wash chamber flange. Tilt DW onto back, pry the door counter spring brackets out from bottom of plastic tray with a small screwdriver to release the tension holding the tray in place. This should give you access tho the innards. Good luck.

Requires torx head driver, flat screw driver, small adjustable wrench. Great big hammer....... (just kidding)

Check solenoid valve behind kick panel where the water line attaches....