I checked all of the connections on the LED10 line and they all looked good.  I then re-soldered them to be sure.  Still none of the red LEDs light.

I don’t have a scope handy at the moment.  If I get one, what should I expect the signal to look like on this line?

I made the voltage measurements to what I believe is ground using a Fluke 8020A multimeter.

Any other suggestions?
Thanks.   Karl