As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JUST AFTER TAKE OFF CREW REPORTED SMOKE IN CABIN WITH CORRESPONDING LOSS OF RH HYDRAULIC SYSTEM. FLIGHT RETURNED TO STL. CREW MANUALLY EXTENDED THE LANDING GEAR. THE NOSE GEAR HYDRAULIC "UP" LINE, BETWEEN THE E AND E COMPARTMENT AND THE FWD CARGO COMPT, WAS REPAIRED DUE TO LEAKING. THE SMOKE WAS CAUSED BY HYDRAULIC FLUID INTO THE APU INLET.