(Urgent)Half of a string not lighting!

I have 6 out of a 12 diode string not lighting after I moved the fixture.

It's the last 6 of the string.

I've checked everything I can possibly think of...broke connections, grounding, etc. and still haven't solved the problem.

I'm pulling my hair out now! If you have any suggestions on what may be wrong please tell me.

TIA

 

Also it has been running for a couple months over my 75. I'm pretty sure they were all lit when I took it off the tank to swap out a driver.

The driver I swapped is on the other 12 LED string in the build and they all work fine.

It's the one I didn't touch with the problem.

 

Have you swapped the drivers back? Maybe a bad driver is what I am thinking.

 

I never messed with the driver on that string. There are two strings of twelve.

 

I am at a loss as to what it could be as well. The only thing I can think of is maybe that driver went bad for some reason or another. Hopefully somebody else can jump in here and help out.

 

I'm pretty sure it's the driver too now.

I'm measuring .07 volts dc inside the part of the string that is lit and only 8.38VDC inside the lit up portion.

What a PITA.