As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BURN TYPE SMELL ON DESCENT, TRANSITIONING TO A DIRTY SOCK SMELL AROUND 14,000 AND LOWER AFTER IDLE DESCENT SMELL GOT HEAVIER PER PILOTS. AFT OF ROW 25-29. FOUND OIL FROM COOLING FAN DOWN TO GENERATOR AND IN COMPRESSOR INLET IN APU COMPARTMENT. CHANGED APU ON WORK CARD 4900-9001.