Hi,
Former Authorized McIntosh tech, there is a service bulletin regarding the MX-135: locking up replace an IC in the front panel: IC20. Should be able to get the repair at your dealer.
Hope this helps
Former Authorized McIntosh tech, there is a service bulletin regarding the MX-135: locking up replace an IC in the front panel: IC20. Should be able to get the repair at your dealer.
Hope this helps