Just a follow-up here: Marty over at vcfed.org took a look at his 11/45, and he does have +15 (+12 in his case) to CU1 on slots 26-28. His notes indicate a wire from slot 15 (because of his setup he can't conveniently inspect his backplane). It's not clear whether this is from factory, and ECO, or a user mod.
Marty's machine does not have power to CA1 either, so it really does look like this is a typo in the DEC docs.
