520? never heard of that model. is it a DVR?
The installer should fish the line if you pay him.
What more than likely happen if you ordered from a retailer is you might have go a refurbished unit that the retailer got back for a bad one. Or sometimes when they put a unit in and the customer decides they want to upgrade "in the 3 day period" the retailer can redeploy the old unit.
The installer should fish the line if you pay him.

What more than likely happen if you ordered from a retailer is you might have go a refurbished unit that the retailer got back for a bad one. Or sometimes when they put a unit in and the customer decides they want to upgrade "in the 3 day period" the retailer can redeploy the old unit.