What was found
REPORT OF SMOKE IN THE CABIN. DECLARED EMERGENCY, DIVERTED, LANDED WITHOUT INCIDENT. NO VISIBLE SMOKE. AFTER LANDING, STRANGE OIL BURNING ODOR AROUND ROWS 20 AND 21. RAN BOTH ENGINES SEPARATELY AND BOTH BLEED AIR AND PACKS. NO SIGN OF SMOKE OR ODOR REF AMM 36-00-00 AND 21-51-00.