huge netbios traffic

according to this link from spiceworks maybe some old printer causing huge network traffic on NetBIOS - 137 tcp/udp:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Print\Providers\Client Side Rendering Print Provider\Servers*oldservername*

I've got such scenario - near 20k workstations with some missing printers causing huge network - netbios - traffic. Maybe there are resposible for it?