An incredible level of detail has come to light on this subject. Great to see how MLU members are collaborating in researching this vehicles!
I have attached two relevant pages from the
AEDB Design Record, one of which was posted by Colin earlier.
It struck me that no maintenance manual is listed for the 1533X2, something I had not noted earlier. I would like to know if any of the other references listed have survived somewhere? They would be a goldmine for further info!