What was found
AFTER TURNING ON THE APU AND AIR-CONDITIONING, PACS, STRONG OIL/SMOKE ODOR FROM AIR-CONDITIONING. NOTICED IN COCKPIT. PERFORMED A BOROSCOPE INSPECTION. PERFORM OPS CHECK OF A/C SYS WITH APU BLEED & VERIFIED OIL ODOR IN COCKPIT. PERFORMED BOROSCOPE INPECTION OF APU NOSE CONE. APU MUST BE REPLACED DUE TO REPEAT WRITE UP. REMOVED APU AND INSTALLED INSPECTED APU, SERVICED WITH 3QT APU AND STARTER GEN IAW 0MM 12-13-49. ALL LEAKS & OPS CHKD GOOD. NO DEFECTS. WORK COMPLETED IAW AMM 49-10-00. PERFORMED A FINAL OPS CHECK OF APU. & AIRCONDITIONING SYS IAW 49-50-00. CHECKED GOOD. NO OIL, ODOR/SMOKE IN COCKPIT.