PDP8A Power Distribution Board

Hello alltogether, i am restoring a PDP8A at the moment. The machine got a problem in the Powersupply. I think one of the emergency ciruits trigger a shutdown of PSU. In tracing this isue i hab two questions. My 8A`s manufacturing year is 1977. It`s model is 8A620. On Bitsavers i found a matching shematic for the BA8C Power distribution Board from 1976 (File: EK-8A002-MM-002_PDP-8A_Miniprocessor_Users_Manual_Dec76.pdf page 597). The Board Number is 5412000-0-1. My first question is if somone has the Board Layout with it's component locations? My second question is about the DEC4011 Chips. As i inspected the Board i found the DEC4011 Chips. First i think they are the standard CMOS 4011 quad two-input NAND`s. In the shematic it look more like a four Transistor array. Did anyone know somthing aput these Chips? Are there any equivalent parts? Have anyone a Datasheet of it? Marco