As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON THE GROUND WITH APU ON RIGHT AND LEFT PACK IN LOW CABIN FILLS WITH SMOKE, CAUSES THE FIRE/SMOKE DETECTOR TO SOUND IN THE LAV. FOUND APU LEAKING OIL INTO BLEED AIR. REMOVED AND REPLACED APU WITH SERVICEABLE UNIT IAW MM 49-00-02. OPS CHECKS GOOD.