Fair enough too.
That said, if you're a member of a local hackerspace, or there is one nearby, they may be able to help you with the Arduino side. You don't even need to take the printers with you to the hackerspace, just the two Arduino Mega boards. As long as they're running the same code (the arduino sketch, eg: Marlin, Sprinter, etc) then the issue will show up as soon as they're plugged in.
Good luck!
That said, if you're a member of a local hackerspace, or there is one nearby, they may be able to help you with the Arduino side. You don't even need to take the printers with you to the hackerspace, just the two Arduino Mega boards. As long as they're running the same code (the arduino sketch, eg: Marlin, Sprinter, etc) then the issue will show up as soon as they're plugged in.
Good luck!