What was found
SMOKE ACCOMPANIED BY ACRID FUMES, WAS DETECTED IN THE AIRCRAFT CABIN, MISSION POWER CIRCUIT BREAKER SWITCH ON GENERATOR CONTROL PANEL WAS USED TO TURN OFF POWER. CREW DONNED OXYGEN MASKS, CABIN WAS DEPRESSURIZED AND AIRCRAFT LANDED WITHOUT FURTHER INCIDENT. WHILE TROUBLESHOOTING KEYBOARD AT TECH POSITION WAS FOUND TO HAVE INTERNAL HEAT DAMAGE AND EMITTED SMOKE.