Assuming this is a LED light, how long should they last? The left and right brake lights work fine so I'm guessing the brake switch and wiring are probably OK. Before I buy an expensive replacement light, can I assume that it's just the light assembly that's dead? Thanks!

 

I took my bd to the vet 3 days ago, because she wouldnt put on weight. The blood tests came back today. She has something wrong with the way she takes in protein and fat. I think it might be hereditary