This is a cautionary tale for those of us who think "Instructions - who needs em"
So I was building up the ZPDD on the weekend, and in my excitement, didn't bother to read the instructions to the end. I saw the 9V at the bottom of the board (I always try to top mount my 9V jack) and thought to myself "Great, Bean's put a 9V feed to the LED at the bottom", and my brain made the incorrect assumption that there was a CLR within the circuit, which of course there isn't because that's not what it's specifically for.
So, wired it up, gave it a quick test, everything worked, boxed it up, attached the LED and started riffing. Smoke, burning smell, and pop of the LED in 4 seconds and I'd realized my mistake.
The good news is, you can use the 9V at the bottom of the board to feed the LED, it does work. Just make sure you install a CLR.
at least it was a quick fix! you could've done much worse ;)