I found the issue. The battery + cable was wedged very tightly between the hard plastic cable guide coming through the firewall and the battery tray. The sharp edge on the battery tray was occasionally making a bad electrical connection to chassis by cutting through the insulation on the + cable. A good electrical connection would cause the battery to fail catastrophically and there are signs fo that happening in the past. Not sure if this happened during assembly or if it was done by a heavy handed mechanic.
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