What was found
ELECTRICAL ODOR IN FLIGHT DECK ONLY WITH ENGINES RUNNING AND APU ON. SMELL DISSIPATED AFTER SWAPPING TO EXTERNAL POWER. CABIN UTILITIES SWITCH OFF. T/S ELECTRICAL SMELL IN FLIGHT DECK PER FIM 21-00 TASK 806. INSPECTED E/E BAY WITH NO FINDINGS, RAN PACKS WITH APU BLEED INDIVIDUALLY, TURNED RECIRC FAN ON AND OFF. SLIGHT ELECTRICAL ODOR RETURNS WITH RECIRC FAN ON. RECIRC FAN DEACTIVATED. OK TO CONTINUE PER MEL 21-31-02. REMOVED & REPLACED RECIRCULATION FAN IAW AMM 21-25-02.