What was found
FOLLOWING APU START, DETECTED FAINT ODOR OF ATOMIZED OIL IN COCKPIT AND CABIN. ODOR REMAINED DETECTABLE THROUGHOUT FLIGHT WITH APU OFF. AFTER LANDING, WITH APU OPERATING AND ENGINES SHUT DOWN, ODOR REMAINED DETECTABLE. ONCE APU BLEED WAS SELECTED OFF, ODOR FADED AWAY. CORRECTIVE ACTION: REMOVED APU P/N:70720189-2 S/N: P-413 AND INSTALLED CUSTOMER SUPPLIED RENTAL APU P/N:70720189-2 S/N:P-455. OPS CHECKS AND LEAK CHECKS GOOD. ALL WORK PERFORMED IN REF TO CE700 AMM 49-10-00.