As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN CREW AND PASSENGER REPORTED GRINDING SOUND OVERWING. WHEN PILOT TURNED THE PTU OFF THE SOUND CEASED. ALSO, REPORTED SMELL OF SMOKE BEFORE LANDING. RAN ELECTRIC YELLOW PUMP ON GROUND. HYDRAULIC PRESSURES INDICATE NORMAL. NO SMELL OF SMOKE IN CABIN.