What was found
NR 1 GENERATOR DISCONNECT CAUTION LIGHT ILLUMINATED, FOLLOWED BY NR 1 BUSS TIE OPEN CAUTION LIGHT. PILOT PLACED NR 1 GENERATOR CONTROL SWITCH TO OFF POSITION. THE VOLTAGE AND LOAD FOR NR 2 GENERATOR APPEARED NORMAL. APPROXIMATELY TWO MINUTES LATER, NR 2 BUSS TIE OPEN CAUTION LIGHT ILLUMINATED FOLLOWED BY BATTERY DISCONNECT CAUTION LIGHT. A SMELL OF ELECTRICAL FUMES WAS NOTED BY PILOT AND MEDICAL CREWMEMBERS. ACFT LANDED AND BATTERY DISCONNECTED. MX FOUND THE Z-200 CARD IN THE MASTER ELECTRICAL PANEL BURNT.