As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRONG EXHAUST TYPE ODOR REPORTED BY F/A. TURNED OFF RT PACK, ODOR DISSIPATED. MX REMOVED AFT STAIRWELL PANELS AND FOUND LOOSE B-NUT AND HYD FLUID LEAKING FROM BLEED VALVE FORWARD OF HYD CONTROL VALVE, LT SIDE OF STAIRWELL. TIGHTENED B-NUT AND LEAK CHECKED. CHECKED GOOD. FOUND HYDRAULIC FLUID CONTAMINATION IN APU INLET. PERFORMED APU DUCT BURNOUT. OPS CHECKED NORMAL. STAIRWELL PANELS REINSTALLED.