What was found
FLIGHT CREW SMELLED A 'STRONG ELECTRICAL ODOR' IN THE COCKPIT AND CABIN. THE ODOR WAS REMINISCENT OF BURNING ELECTRICAL INSULATION AND/OR SHORTED ELECTRICAL WIRING. THE AIRPLANE CHIEF NOTED THE AIR CONDITIONING AND HEATING DUCT TEMPERATURE TO BE OVER 160 DEGREES FAHRENHEIT. ALSO, THE ODOR WAS MOST NOTICEABLE NEAR THE VENT OUTLETS. TROUBLESHOOTING REVEALED THE COOLING TURBINE SHAFT WAS SEIZED, IT COULD NOT BE TURNED WITH HAND PRESSURE. THE COOLING TURBINE ASSEMBLY WAS REPLACED AND THE AIRPLANE RETURNED TO SERVICE.