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Excessive current is probably blew out the LEDs in the first place. I would put a current limiting resistor in series in the circuit until you figure it out.
I replaced some LEDs in a set once and as soon as I got it re-assembled, it blew another LED. Arggghhh.
There are TWO ways LEDs go bad. Open which gives no current. And short which gives higher current. Often, one will short and create higher current which, then, blows out another, causing an open LED.
Good luck!
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