Well thats true, but the problem is that i have not yet seen any successful repair for the Dualogic system without replacing the whole unit, the system keeps on failing after few months, i think its because of the "older" version of the Dualogic robot and the lack of professional knowledge with this system.
The old robot pump will also "whine" when opening the door for about 10-12 seconds, the newer one about 6-7 seconds, so there's definatly a change - but i have no clue about the reliability of it.