Time Capsule no longer available

I found an error message on my iMac workstation (OSX 10.7.5, Lion) indicating that my Time Capsule (Model A1409) was not available for backup. The TC is not visible using the iMac Airport utility 'No configured base stations can be found'. The Green light is lit on the TC, a hard restart of TC had no effect on the problem.

The TC is used only as a backup disk, plugged into a port on my Cisco home router. The iMac ethernet is also plugged into the router, iMac wi-fi is turned off. I used Bob Timmons instructions for installing TC in Bridge Mode about a year ago which worked perfectly. Wireless connectivity to TC over my home network still works for Airbook backups.

I can see the TC in my router’s DHCP table. Using the AirPort Utility Menu; (File , Config other) I can enter the Time Capsule IP found in my router, and password, to access and change TC settings which are as follows;

There are 6 tabs; Summary, Base Station, Internet, Wireless, Network, and Disks.

-The internet is set to 'connect using DHCP'.

-IPv6 is configured 'Automatically', Mode 'Native'.

-Wireless Network Mode is ‘Off’.

-Network Router Mode is ‘Off (Bridge Mode)’.

I’m trying to bring the TC back from being invisible so I can use it again. Appreciate any assistance. I installed and uninstalled bonjour from a network PC in the same timeframe that backups stopped a couple of months ago, don’t know if this is related.