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Itech 12000 mainboard issue

So, I have a pair of itech 12000 amps that gave me a fault light. I tested everything in a 3rd unit and all tested just fine except for the main board.
I replaced the main boards on both of them, they worked fine for 1 show, and the next time they went out, they returned with the fault light on again.
Any ideas what could cause it? The subs and speakers all tested fine and worked with other 12000's and 4x3500's in other shows
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