What was found
DESCENDING THROUGH 12,000 FEET FUMES NOTICED. PACK ONE OFF CLEARED THE FUMES NO ODOR FROM PACK 2 APPEARS TO BE LIMITED TO COCKPIT ONLY. DESCRIPTION OF ODOR/FUMES: PERSISTENT, OIL/BURNING OIL SMELL. APPARENT CABIN SOURCE: UNKOWN, FLIGHT DECK. NO VISIBLE SMOKE/HAZE. NO MEDICAL ATTENTION REQUIRED.-TROUBLESHOOTING ACCOMPLISHED IAW TSM 05-50-00-810-831-A. CABN ODOR ISOLATED ODOR TO TYPE 2, POSSIBLE SOURCE ENG 1 BLEED IAW TSM 05-50-00-810-831-A, LEVEL A DECONTAMINATION ACCOMPLISHED PER AMM 21-00-00-615-802. SEE LOG PAGE 3376615-2,3376616-1 AND 3376616-2 FOR DISPOSITION.