As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INBOUND CREW HAD RT FLUID DROP BELOW 9 QUARTS, THEY FOLLOWED QRH AND LANDED AT 5 QUARTS. MX DISCOVERED HYD LEAK FLUID INGESTED INTO APU. CABIN FILLED WITH SMOKE. MX REPAIRED LEAKING HYD LINE. CLEANED APU INLET AND PERFORMED PACK BURN OUT IAW AMM 21-20-02. COALESCER BAGS WERE REPLACED. ACFT OK FOR SERVICE.