As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB BOTH AFT LAVATORY SMOKE DETECTORS ALERTED AND F/A REPORTED SMELLING AND SEEING SMOKE. AFTER 1 MINUTE THE SMOKE DETECTORS SILENCED AND THE SMOKE DISSIPATED. CREW ELECTED TO RETURN TO DEPARTURE. MAINTENANCE FOUND HYDRAULIC FLUID DRIPPING FROM DRAIN JUST FORWARD OF APU INLET AND CONTAMINATING THE APU. SOURCE OF LEAK WAS FOUND TO BE THE RT MLG RETRACT ACTUATOR AND THE AFT AIR STAIR ACTUATOR. REPLACED BOTH ACTUATORS AND ACCOMPLISHED A MINI-DUCT BURNOUT.