Pioneer always made reliable receivers and the SX series was no exception (I've serviced hundreds of them). However you have to understand that the unit is not 'permanent', in that the filter capacitors in the power supply need to be replaced, and likely a good number of the electrolytic coupling caps as well.
IMO it will not be worth it to rebuild, but for $40, if it is working, you might get a few years out of it before it dies completely, although the unit will not perform the way it is supposed to.
IMO it will not be worth it to rebuild, but for $40, if it is working, you might get a few years out of it before it dies completely, although the unit will not perform the way it is supposed to.