Note the 'flag' NL stands for Network Local, meaning that this route is directly learned via the ptp31 interface. Only static routes can be deleted by hand. To get rid of this route you need to get rid of the ptp31 interface.
To see all interfaces do a 'ifconfig'. Check to see if ptp31 is a "SUSPENDED" interface. If it is then the previous owner was probalby using a location to dial on demand. You'll have to delete it.
Of course it you are looking to set the unit back to its factory default configuration use the 'set register 0xffff 0x0102' command and then reboot.
-jstorms