I’m not sure what TXU is. It would seem to me that the make is a Santana 20. The builder is W.D. Schock. The MIC for WD Schock is WDS.
Have you tried reaching out to the Santana 20 Class association? There must be someone there who can help you (you might have to join). Their URL is: https://www.s20.org/
Hope this helps.