As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAV SMOKE DETECTOR ALARM SOUNDS CONTINUOUSLY. PACKS APPEAR TO HAVE BEEN OVERHEATED. COOLED DOWN PACKS. NO VISIBLE SMOKE IN CABIN, BUT COULD SMELL PACKS BEFORE COOLING DOWN. LAV SMOKE DETECTOR CHECKED GOOD AFTER CABIN CLEARED OF PACK ODOR. CHECKED A/C PACK GROUND COOLING FAN AND RAN PACKS. PACKS CHECKED NORMAL. FOUND APU TO BE DEFECTIVE AND PUTTING OIL INTO BLEED LINES. REMOVED AND REPLACED APU IAW EMB120 MM 49-00-02.