As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL220 FLIGHT REPORTED MID LAV SMOKE DETECTOR ACTIVATED. GRAY HAZE IN CABIN. OIL CONTAMINATION RMVL DUE TO RECENT BLEED DUCT CONTAMINATION CAUSED BY APU OIL LOSS. APU REMOVED AND REPLACED, ACCP TOD MM49- 11-01, UP TO AND INCLUDING, INSTALLATION STEP 5, ITEM 5, PAGE 408. COMPLETED APU INSTALLATION.