If you contact Magnepan, they have rebuild kits available for all their speakers at reasonable cost. The repair kit has instructions on use and the other materials needed that can be sources locally.
If the speakers are working but the woofer wires have delaminated from the mylar diaphragm, then it is what most videos show on YouTube with the glue removal using acetone, alcohol and cotton balls. You need Super77 spray glue to reattach the wires and the other glue to seal them that comes in the kit.
The wire is aluminum and the quasi ribbon is aluminum foil that is 1 micron thick. It is part of the repair kit they offer if needed. Yours may not need the wire and foil.
My MG10/QR's were working correctly, so I did not have to reglue them, just rewire them to the new connectors for direct drive.
Good luck with the repairs.