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You will need to pull the radio- check to see if there is an auxilliary fuse built into the back of the radio, near the connectors. If there is not, you are going to want to check for power to the radio on the large power wire (should be red or black) If you have power, but the radio will not turn on, then you can send it out. Most cities (or even small towns) have a shop that specializes in electrical repair, you may just have to call around- many old television shops, radio shops, or even small auto specialists that do alternator rewinding and other seemingly obsolete skills may have a source for a radio or module repair specialist.