As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT WITHOUT APU RUNNING, PASSING 18K, HAD A COCKPIT ODOR. ODOR GOT STRONGER PASSING 5K, PERFORMED INFO NOTICE AND TASK 05-50-00-810-831-A. INSPECTED THE APU IAW AMM 49-00-81-810-874-A. FOUND DRAIN LEAKING OIL FROM AFT DRAIN TUBE. PERFORMED TASK ECS DECONTAINATION IAW AMM 21-00-615-002A. R & R CABIN RECIRULATION FILTERS IAW AMM 21-00-00. R & R THE APU IAW A320-49-11-11-400-004. OPS & LEAK CHECKED GOOD.