CSU Manuals

Can anyone help, we are looking to see if we can find any overhaul manuals for the BX10 CSU as fitted to the Gipsy Queen ll Engines. We have the installation and maintenance manual but not the overhaul. My contact at the RAF museum has looked and they don’t have one either.
We also need a manual for the Rotax LX generator 12volt, again no luck so far.
Thanks
ken