New TC but now Time Machine can't find network backup drives

I had a 2 GB TC replaced under warranty (many thanks to LaPastenague who suggested I may be able to get a replacement under warranty).  Configured the TC using Airport Utility, and after a bit of messing around (had to delete and re-find the USB printer) everything seemed to be working fine.  However ....
I have a MyBookWorld network drive as an alternate Time Machine backup disk, and my MacBook found both the TC and MBW and backed up to them alternately just fine.
However on another MacBook I removed the MBW drive as a backup disk in TM preferences, and now I can't add it back to that Macbook's list of backup drives.  I get the "can't find that server" error dialogue.  Which is crazy because the other shares on the MBW drive are visible - it's just the backup partition (WD_Backup) that isn't found.  I figure it's trying to connect to the IP address of the previous TC, which probably changed when I replaced the TC, or something.
Help please !
TIA ... John.

Manually mount the directory in finder.
This is so much more important on Mavericks than it used to be due to its default to SMB networking.
I guess I also do not know if you should mount this via AFP or SMB but try both.
So in Finder.. Go.. connect to server.
Type in the actual name or IP of the device.
AFP://MBW.local/WD_Backup (where MBW is the network name of the device. local is the domain (assuming it is connected to the TC))
No luck try AFP://MBWIPaddress where you simply type in the IP.
You might find it is easier to pick up the directory from the other Mac where it is working.
Click on Get Info and look at the directory URL info.
If no luck use SMB://MBW.local etc.
Come back to us if it still does not show up.

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