PDP11 Plessey disk drive info needed

Hi all, I would like to connect a Plessey disk drive to a PDP11 RK11-D controller. The drive has a fixed platter and a removable platter, compatible to RK05 I believe, and these numbers on it: Plessey 3468-0231 PMDD/11B 700540-200217D It has a 42 pin MRA 42 S mating connector, and same with a terminator. I believe the 42 pin should be a Drive Bus, to be connected with standard Unibus cable to controller slot 2A/2B. Question: Would anyone have a maintenance manual for the Plessey drive available ? Short of that, maybe the pinout of the connector, so that I can make the cable ? Of course, reverse engineering of the disk electronics should reveal the pinout/RK11 compatibility, but having the docs just would save a lot of work and be more reassuring ! Thanks and regards John G. Zabolitzky