What was found
STRONG FUMES OF UNKNOWN ORIGIN IN AFT GALLEY. FIRST NOTED WHEN OVENS POWERED IN FLIGHT. DID NOT DISSIPATE WITH GALLEY POWER OFF. NOTED AT FL 350. DIVERTED TO KDFW. FUMES GOT STRONGER ON DESCENT THROUGH 10,000 FT. SEVERAL PASSENGERS REPORTED NAUSEA AND HEADACHE. RAN ENGINES TO TAKEOFF POWER. UNABLE TO DUPLICATE. SUSPECT AFT GALLEY OVEN FOOD DEBRI. ALSO, DFW AIRPORT DPS SUSPECT POSSIBLE PEPPER SPRAY LEAKAGE FROM PASSENGER LUGGAGE. RAN BOTH PACKS AND PERFORMED CABIN INSPECTION, NO DISCREPANCIES NOTED. OK FOR SERVICE.