Tips needed on repairing cat-damaged window seals.

Well, the thread title say it all really.

A couple of years back SBB put some lovely new windows in, to help combat the street noise.

One of the windows has been damaged by a cat stretching/sharpening claws. The silicone seal is all messed up, and I think sections of it need to be replaced.

Can anyone tell me if it is possible to remove some of the seal and replace it myself? Or is that a bad idea, and best left to the landlord to sort out and take off of my deposit?

Really need a handy, handy-man!

Thanks for reading.