MARLIN MODEL 28 12GA NEED DISASSEMBLY INFO

[9945]

I'm looking for an owners manual, or, something to show me how to disassemble and reassemble this gun. If, anyone can help it would be appreciated.
The gun is a take down model.

[2342]

i would also like info on model 28 pump 12ga. serial #12516. can not seem to find to much on internet, actually gun looks in pretty good shape, just cleaned up insides, thanks thinking about trying some trap..