It`s a kuid which isn`t used for the loco, it only stands in the kuidtable. You can safely delete this kuid from the kuidlist at the bottom of the config and your problem is solved.
All at TPR's Download Depot, parts for diecastgalore's SP U25B. If you missed them, the CB&Q and SP U25Bs are there too, both have option parts, CB&Q has more. They represent different phases, there were one or two others but they have not been released yet.
My mistake. After setting up the config file, I realized that the SP horn was already the correct color and did not need to be recolored, but forgot to change the config file because everything worked fine.