Rx8Tonic

So i had my engine replaced by a shop who says they put everything back in correctly but ever since they replaced it the power steering hasn't been working. I've tried cleaning the connectors and all that but it didn't work. I took it to mazda and they said it seems like my whole system is getting to much voltage. The little LED in my console which says "RX8" when you start it up IS full bright read when ever i cut my car on. if the car is switched to on but not actually cut on its perfectly clear. So there saying that before they can figure out the powersteering issue i need to figure out the voltage issue which could be causing it first. They've had it for 4 days trying to figure it out but now they want to start charging me by the hour to "TRY" and figure it out.

Does anyone know what that could be? What could throw the voltage off on my car. i've checked all the fuses and everything... HELP PLEASE.