It seems like Onion only partly discontinued the Rocki expansion. I've gone through Onion's blog. Shipping of the Rocki expansion is still mentioned in the Kickstarter and Indiegogo updates on February 22 and 24 (https://onion.io/blog-kickstarter-update-february-22-2017/). About two weeks later, in the Kickstarter update on March 6, it is listed as no longer available due to manufacturing difficulties. Nothing is said in that particular update about the Rocki expansions that were actually shipped. But in the Kickstarter and Indiegogo updates on march 8, they repeat that it is no longer available. But they also add, "This applies to backers who have not yet completed the survey. If you have already completed your survey and ordered these items, you will be getting them!". And that's the last mentioning of the Rocki expansion in Onion's blog. So, of course I am hoping for some kind of documentation.
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I think this is simply a wiring issue - I've had it come up before. The number should be 28.<something>. The 00.400.. is what I think is called a ghost ID - a temporary one that doesn't actually reference anything and gets replaced once communications are established.