As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AT LEVEL OFF FL 380 FLIGHT ATTENDANT REPORTED BURNT COFFEE SMELL AROUND ROW 14 SMELL LASTED APPROXIMATELY 3 MINUTES IN DESCENT BELOW 10000 FEET IDLE THRUST DIRTY SOCK SMELL THROUGHOUT ENTIRE CABIN & FLIGHT DECK. REPLACED APU OIL COOLING FAN AND ACCOMPLISHED A SATISFACTORY LEAK / OPERATIONAL CHECK PER AMM 49-52-51.