i kinda expect abs to yellow after awhile, but didn’t expect it to be that fast? was it in a place regularly exposed to sunlight/UV?
i just remembered i had Boba U4 RGB switches mounted on a board. when i went to change keycaps (some of the switches regularly come off the plate/pcb becos of tight keycaps), i noticed that the lower halves of the switches have all yellowed. couldn’t confirm what materials were used in the bottom housing but the tops were clear polycarb