There are 5 TVS diodes on this board but I was reading the silk screen wrong and thought TVS5 was the small diode directly above it. I ruled all the others out because of their small size. But now that I'm reading the silk screen correctly TVS5 is an SMAJ51A which is the correct package size and seems like it might fit. Voltage across TVS5 is also 42V.
Thanks,
Jerry