If the cables aren't frozen, WD40 those and then squirt teflon lube in them. The rotor discs, light rust, wouldn't steel wool or even the brake pads themselves grind that off after a couple of rides down a hill or bridge ? I get the forbidden error too for the pics, perhaps attaching the photos in this thread would make it easier for all ? So I'm making blind suggestions here. But if the bike still rides, clean up the gunk on the chain and oil it. You don't want to make the bike the envy of the University, that may get it stolen ?