Thanks

RE: The first step is to check the 5 LEDs that are not lighting up to see what the issue is.  Check to see, for example, if any of the LEDs is backwards by looking for the flat sides of the collars.  Check to see if any of those LEDs is not properly soldered.  If that all looks fine, then one of the LEDs may have been damaged.  Use a fresh LED, and place its two pins across the pins of each of those 5 LED locations, to see if it will light up a little bit.  

I tested the five dead LEDS in the dead quadrant, and four of them lit up an LED that I held across the pins. But I was not able to get the fifth to light up at all. (The fifth also looks like it is the last one in the series). 

I then swapped out that fifth dead LED with a new one, and it is still dead (as are the other four.) Suggestions?