As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 3 ENGINE LT HAND THRUST REVERSER COOLING DUCT ON THRUST REVERSER UPPER SIDE HAS CHAFING DAMAGE. WELD REPAIRED DUCT BY WELDING IAW FEDEX EA 8-7830-83937, NR 3 LEFT HAND THRUST REVERSER FORWARD COOLING MANIFOLD CHAFED. REPAIR, REINSTALLED NR 3 ENGINE LEFT HAND THRUST REVERSER COOLING UPPER DUCT IAW MD10 MM 78-00-00. REFERENCE NON-ROUTINE N00899.