As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED UPON DESCENT INTO CLT DUE TO THE FLIGHT CREW REPORTING A DIRTY SOCK SMELL WITH ENGINE AT IDLE. THE AIRCRAFT LANDED SAFELY AT CLT WITHOUT FURTHER INCIDENT. APU OIL COOLING FAN FOUND TO BE LEAKING OIL. REMOVED AND REPLACED O-RINGS PER AMM 49-52-51.