What was found
DISCREPANCY: FUME EVENT (SMELLED LIKE ACFT OIL) ON APCH TO CUN. C/W QRH, MASKS ON, SWITCHED OFF LH PACK. A4FTER LANDING, FA'S SAID NO ODOR IN CABIN, BUT THEY COULD SMELL IT ON FLIGHT DECK. PLACED #1 PACK ON MEL# 25-52-01F. CORRECTIVE ACTION: REFERENCE MEL 21-52-01F - REACTIVATED PACK 1 FLOW CONTROL VALVE. PERFORMED TSM 05-50-00-810-831-0-A, COULD NOT DUPLICATE ODOR, NO ODOR PRESENT AT THIS TIME. OPS CHECK GOOD. THIS ACTION CLEARS MEL,PLACARDS REMOVED, AC OK FOR SERVICE. IAW TSM 05-50-00-810-831-0-A.