What was found
SLIGHT ELECTRICAL ODOR WAS DETECTED APPROACHING DESTINATION. TURNED OFF GASPER FAN. ODOR WAS STILL DETECTED AND BECOMING STRONGER. DONNED OXYGEN MASKS RAN QRH SMOKE, FUMES, ODORS CHECKLIST. DECLARED ATC EMERGENCY LANDED AT RWY 9 WITH FIRE TRUCKS IN TOW. AT GATE, SHUTDOWN ACFT UNTIL ALL POWER OFF, LEFT ACFT. FLIGHT ENGINEER REPORTS VISUAL SMOKE NEAR FO`S LIDO BAG AFTER RUNNING QRH CKLIST. POSSIBLE OUT OF GASPER VENT BY LANDING, SMOKE CLEARED. AT CREW DEPARTURE STILL COULD DETECT SMOKE/ WIRE/ INSULATION BURN. GASPER FAN CAME APART, REMOVED AND REPLACED GASPER FAN IAW 21-23-001-4. CLOSED FINAL.