What was found
SEA- RAMP REPORTS ODOR OF EXHAUST IN AFT CARGO HOLD. WITH A MECHANIC IN AFT CARGO HOLD PERFORMED MULTIPLE APU START/STOP CYCLES W/ BLEED AIR ON. NO DEFECTS NOTED. ALSO PERFORMED 2 ENGINE START/STOP'S W/ BLEED AIR ON W/ NO ODORS NOTED. PERFORMED GVI & ODOR CHECK W/ NO DEFECTS NOTED OF AFT EQUIPMENT BAY. PERFORMED GVI OF APU COMPARTMENT W/ NO DEFECTS NOTED. O.K. FOR SERVICE. COULD NOT DUPLICATE. NO PARTS REPLACED.