First time troubleshooting something like this so I appreciate the help. I've measured voltage at the bulb locations in that row and all of them read in the mV. When I measure across CN6 and CN7 connector pins for the return and drive for that row, I get 7 volts. I've measured across other pins on those two connectors when that Row is active and I get about the same voltage.
Also, none of the lights work when testing them in their columns either.
Is this telling me that I have a shorted/open conductor somewhere before the first light in that row? And would that be LB5 according to the manual?
Thanks again.