It means it's a white wire with a brown stripe spiraling around it. It's best to check wires with a multimeter for continuity. Check for a broken wire, but also check at the plug on the main cpu board (plug 1j10, pin 9) and see if it looks burnt or messed up. The problem may be in the board itself, so don't go crazy looking for a broken wire if you have continuity from the switch to the plug.