I took a good puck from one of my working lights and swapped it with a puck from the bad light, then put back on the mother board, plugged it in, then did the same with each puck until I found the bad one. Fortunately it was on the 4th puck I tried rather than the 8th.
I let AI know this and here was their reply:
"Thanks for the update on this Chad and glad to find the issue causing this to happen. We can ship out another puck to you however would be via USPS Standard Mail (may take up to 30 days or so to get to you). If you would like to expedite this we can ship to you Priority Mail (6-10 days) however the cost to do this is $25 to do so. If you wanted to do this I can send a link for payment and can have out to you today. Please let us know, thank you.
Kind Regards"
That's particularly annoying to me. Here's my reply:
"I'll take the free shipping. Though I must complain as I paid shipping already for a working unit. Since that's not what I got it seems AI should cover getting me my product. I feel I've been very patient and went through a lot of effort to trouble shoot this light. I found the problem, it seems AI's part could be to fix it more quickly than 30 days or asking another $25 out of me to do it faster."