Search for disassembly guide for Pentacon 135/2.8 "zebra" version, that's the same lens.
"Preset" version look quite similar mechanically too.
I had already done the search for 'Pentacon 135mm f/2.8' as well but I came up with nothing helpfull.
But when I do a search with your wordings I get the following guide, which tells me all I need to know:
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