1991 Buick Riviera Q&A

1991 Buick Riviera Question: pcm fuses blowing

car cut off and mechanic replaced fuse yesterday and everything was fine. today radio was on without engine for about 40 minutes and then radio began sputtering. car would not crank. used another battery and car immediately. let car continue to run while switching battery. as soon as my battery was replaced engine died and 15 pcm fuse blowed and continued to blow. bought new battery and 10 new fuses. all blown with new battery. tried higher voltage and still blown. what could be causing? did not come in contact with any wires. -
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Any idea where to check for the short?