Cat dribbling on furniture

[Fender1]

My 7 year old female cat started peeing on furniture about a month ago, so we took her into the vet and all the tests and such came back normal, we got an extra litter box and she stopped. But recently she's been dribbling on the furniture. Not emptying her bladder like she used to, just little dribbles, She still goes in the litter box and we haven't changed anything. Should I take her back to the vet??