hi,

if you can't find devices.pci.77101223.rte..5.2.0.0 you can download
devices.pci.77101223.rte..5.2.0.40 and see the preview of the install,
I think there shouldn't be any problem because you are already in
52-004.
then you can upgrade it to devices.pci.77101223.rte..5.2.0.50.
to make the mksysb skinny you can use /etc/exclude.rootvg.
in this file specify the file systems that are in rootvg that you don't
want in mksysb image.
hope this helps

regards,
Selvan