As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FAT - FLT 2530-SUPP, RETURNED TO FIELD. AFT LAV SMOKE DETECTOR LIGHT. NO EMERGENCY DECLARED. NO CURRENT STATUS MESSAGE. INTERROGATED MDC SERVICE MESSAGE HISTORY. FOUND LAVATORY EXTERNAL FAN LOW SPEED MESSAGE. FOUND EXHAUST FAN INLET GRILL PARTLY PLUGGED WITH LINT, CLEANED, NO DEFECTS NOTED. NO PARTS REPLACED. AIRCRAFT WAS RETURNED TO SERVICE.