Yeah, I was going to suggest that as a last resort, Thomas..
The manual of course says that any repairs should be referred to Alesis, but it says nothing about voiding warranty if you pop the top and have gander at what's inside.
First thing to look for would be convertor components at the I/O ports. I wouldn't expect much in the way of a chunky CPU as it's "only" EQ, but an assortment of chips (note their labels and any codes stamped adjacent to them on the board) could give the game away.