What was found
DESCENDING THROUGH FL 240, FIRST OFFICER SMELLED A SLIGHT CHEESE ODOR WHICH WENT STRONGER, CALLED F/A AND THEY REPORTED A SLIGHT SULFUR ODOR. RAN ODOR ELIMINATION PROCEDURE AND REMOVAL OF SMOKE BELOW 10,000. PERFORM AN ISOLATION PROCEDURE IAW TSM 05-50-00-810-831. RAN THE NR 1 & 2 ENGINES WITH PACKS WHILE ALTERNATING ENGINE BLEED 1 & 2. INSPECTED THE ENGINES FOR OIL LEAKS. NO LEAKS FOUND. AIRCRAFT OKAY FOR CONTINUED SERVICE.