What was found
DURING APPROACH WITH ENGINE BLEEDS SELECTED, JUST AFTER STARTING APU, NOTICED A STRONG OIL . FA CALLED AND REPORTED THAT SHE AND THE PASSENGERS SMELL A STRONG OILY ODER. FUMES WENT AWAY AFTER DESELECTING 10TH STAGE BLEED AIR. (FLIGHT 4273 - FILED CLOSED) STARTED AND RAN THE APU FOR 15 MINUTES IN REFERENCE TO THE CRJ-200 AMM 49-10-00. RIGHT AFTER THE APU STARTED, TURNED THE L/H AND R/H ACMS ON, HAD A STRONG SMELL OF OIL. AFTER SOME TIME, THE ODOR WENT AWAY. CLOSED THE APU LCV. STARTED AND RAN THE R/H ENGINE FOR 15 MINUTES IN REFERENCE TO THE CRJ-200 AMM 71-00-00. OPENED R/H ENGINE 10TH STAGE VALVE. DISCOVERED A SMALL HINT OF OIL ODOR. CLOSED THE R/H ENGINE 10TH STAGE VALVE. STARTED AND RAN THE L/H ENGINE FOR