Time Machine won't see my backup after resetting Time Capsule

i had to reset my TC because i got a new modem.  once i got the network up and running again, now time machine wants to start over backing up my MBP, even though i can see the backup files on the TC....
how do i get time machine to recognize that this time machine has my backups on it already?
I had changed the name of the TC, then i changed it back.  so i don't think that's the problem? 
will i have to erase the time capsule and start over backing up?
thanks in advance...

TM may start a new backup sequence for any of a number of reasons. See #D3 in the Time Machine - Troubleshooting *User Tip* at the top of this forum.
Click here to download the +Time Machine Buddy+ widget. It shows the messages from your logs for one TM backup run at a time, in a small window.
Navigate to the first of the backup attempt that failed, copy and post the messages here. A clue should be lurking in there.
i'd like to keep those backups because there's some important stuff in there.
That's a curious comment. Have you been deleting things from your internal HD, relying on TM to keep it's copies archived?

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