What was found
DURING FLT, WHEN CKPT TEMP SEL TURNED FROM FULL COLD TOWARDS HOT, A EXHAUST/FUEL ODOR DETECTED. ODOR BECOMES MORE PRONOUNCED AS AIR GETS WARM. TURNED SELECTOR BACK COLD, ODOR DISSIPATED. SAME ODOR ALSO WHEN OPENING ACCESS DOOR TO TAIL CONE. REMOVED CONDENSER BAG & FOUND DIRTY. SOURCE OF ODOR. INSTALLED NEW CONDENSER BAG IAW AMM U-20-21. GROUND RAN ENGINES, 20 MINS DURING OPS TEST IAW AMM 21-51-00 & NO EXHAUST OR FUEL ODOR IN HOT. NO ODOR IN AFT MX BAY DURING LEAK CHECK. R & INSP CONDENSER BAG & FOUND NO CONTAMINATION. INSPECTED ECS DUCTS, FOUND NO CONTAMINATION. ACCOMPUSHED TASK.CARD TC-5XL-21-120902MR1. NO DEFECTS NOTED.