I noticed I have a bad led on my newly bought power cell board. 
It’s the fourth blue led from the top.
I ensured that the ribbon cable is fitted well in the connectors. I turned the electronics on an of a few times. For once I had the led back. It flickered a little. But it went out again. Is this usual? Is there something I can do?
Sure.
Contact the seller for a replacement…
I will do. 
I had an issue with the bar graph on the wand kit. Some leds in one end didn’t light up. I thought it was broken. I searched the forum and found that I should try to reverse the ribbon cable. I did, and it worked! I would never thought about that myself. So I hoped maybe there was some magic that could fix the power cell led also…
But I’ll contact the seller. PM incoming AJ.
Unfortunately every once and a while the Power Cells have a bad LED. Its a consequence of having 10,000 LEDs.. one of them is bound to go bad.
For the record I just wanted to end this thread with a post saying that I received the new LEDs a while ago. The bad LED is replaced now and all LEDs are working!
My friends mother in law actually works with soldering and circuit boards. So she changed it for me. I appreciated that.
And thanks for the LEDs AJ!
Glad to hear!
For those wondering. We decided it was best to just send an LED since Cadger lives in Norway and shipping the board back and forth would have been costly. Normally Spongeface or I would send a replacement and replace the LED ourselves.