What was found
ODOR OF ELECTRICAL FUMES FROM UNKNOWN SOURCE. UNABLE TO ISOLATE. VISUAL INSPECTED WIRE BUNDLES & TERMINALS, BLOCK IN FWD E/E. NO FUMES BURNED OR CHAFING NOTED. INSPECTED STALL INVERTER. BATTERY CHARGER, WX RADAR TRANCEIVER FOR SIGNS OF BURN, NO FAULTS NOTED. R & I RECIRCULATING FAN FOR DAMAGE OR BURN, NO FAULTS NOTED. REPLACED FAN IAW 21-58-01, 21-25-01. RAN BOTH ENGINES & OPERATED BOTH PACKS WITH ENGINE BLEEDS & APU BLEED WITH RECIR FAN OFF & ON. CYCLED ALT EQUIP COOLING SWITCHES SEVERAL TIMES, NO FUMES OR FAULTS NOTED. ENGINE RUN ACCOMPLISHED FOR 1 HOUR WITH A/C PRESSURIZED, UNABLE TO DUPLICATE ON GROUND. INSP EQUIPMENT COOLING DUCTS AND A/C DUCTS AND TRIM AIR VALVES IN FWD CX. NO LEAKS OR DAMAGE.