I have the same issue
Hi Gene (Sorry, I know this is an old post),
I believe I am also experiencing the same issue where it is leaking in between the pump housing assembly and the motor. I have a Whirlpool DU890SWKU0 which appears to be the same as the RUD1000KB1, so I have the part numbers. I'm a novice at this but willing to try - would you happen to have step-by-step instructions on how to remove and disassemble the pump and motor parts from the dishwasher? Would I have to remove the dishwasher from under the counter to perform this fix?