IRS BETA Repair

Hi, 

Does anyone out there know a technician that is familiar with the IRS Beta's.  Having a feedback problem with the servocontroller. Not sure whether it is the controller or the control woofer.  When I plug the servo control cables in I get an overload of the amp that controls the woofers.  The safety cut out kicks in.  Is the module for the control woofers servicable?

Thanks in advance.