More perplexing are the negative voltages:

CPU Core * *1.48
Aux * * * * * * 3.09
+3.3 * * * * * *3.33
+5 * * * * * * * 5.08
-12 * * * * * * -9.32
-5 * * * * * * * -7.71
+5 S/B * * * * 4.44

I don't see a + 12 or +5 displayed. *The -12 and -5 seem way odd since
eveything works well.

Shouild I be concerned?

I would not worry about that. However you could measure them with a
reliable voltmeter to be sure. -12V are used for the serial port, if
you have something connected there like a serial mouse that could
explain the voltage drop. If it works, leave it as is. I think there
is nothing nowadays using the -5V rail so that could explain it is
slightly higher.