Zevatech or Juki 720 Pick and Place

I have a Zevatech 720 that was working great until one day a "E9001 the emergency stop button has been pressed..." error popped up when I turned the machine on. We traced out the circuit and found out what board it went to. I found a replacement and installed it but it is still doing the same thing. I know the emergency stop works all the way to the board, and the board was tested before it was shipped to me. Does anyone have any ideas on what to check to fix this problem?

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