Early PDP-11/45 backplane SPC power

So, after finding that a DL11-E wasn't working in the backplane SPC slots (26-28) on my 11/45, I took a closer look. The problem isn't exactly what I had expected -- -15V seems to be distributed there, but +15 is not. Looking closely at the print sets, the listed configurations only mention DL11-A, the 20ma current loop model, which wouldn't require +15 to work. I wonder if some +15 distribution wires were added in an ECO, or maybe EIA console from the backplane SPC slots was never supported for these early 11/45s (mine is serial 152). There's one other oddity -- the power distribution table in EK-11045-MM-007, page 510, implies that +15 should be distributed to the SPC slots on CA1. I'm wondering if this is a typo, since I'd expect that pin to be NPG? The DL11-E looks to be expecting +15 on UA1 in any case.