These chassis' are post-Bob's time in the business, but y'all have been using the U2000 cap kit for them for about 3 years now and I've not gotten any negative feedback, so I assume they were designed or modified from the U2000 chassis. The essential cap list matches positions & values for the electrolytics, in any event.

I've recently learned that the remote bds are the same, as well, so I have put together a basic pot kit for the K7401 remote bd which may help you with your U2000 remote bd problems, also.

I don't have a K7400/7500 to physically verify any of this, so it's just info I thought some could use based on other hobbyist experiences.