Had these since new years. Couple weeks ago my left outer light went out - upon replacing and testing if it works, I realized that my left lights are not sequenced anymore

Nonetheless, the lights are "on" - its just as if those left lights don't have the harness equipped - yet they do

So I'm not sure when exactly they stopped working in that sequential manner. I'm thinking there's something faulty with the harness. What is the process for getting a replacement?