As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DESCENDING THRU FL100, STINKY FEET SMELL IN CABIN. FAINT SMELL IN COCKPIT. DONNED O2 MASK. RAN QRH. DECLARED AN EMERGENCY. DECISION TABLE SHOWS APU AS PROBABLY SOURCE. OIL LEAK FOUND AT FCU DRAIN LINE. APU WILL BE PLACED ON MEL. ECS DECONTAMINATION COMPLETED. APU REPLACED. (LP 8116622, 8116626)