What was found
EVENT SUMMARY STATED LAV SMOKE MSG. OPERATED A/C OFF BOTH ENGINES AND APU. NOTED SLIGHT GLYCOL SMELL. REMOVED AND REPLACED SOCKS AND CLEANED EXTERNAL RESIDUE IN APU BAY. OPERATED SYSTEM AGAIN AND SMELL DISAPPEARED REF CRJ MM 21-50-00. REMOVED AND REPLACED BOTH COALESCER SOCKS DUE IAW CRJ MM 21-51-13. INSPECTED AIR RT AND LT AIR DUCTS IN APU BAY NO OIL RESIDUE FOUND IN DUCTS REF CRJ MM 21-51-00. EXAMINED LT AND RT HEAT EXCHANGERS NO OIL RESIDUE NOTED IN REF TO CRJ MM 21-51-07. FOUND GLYCOL EXTERNALLY ON DUCTS IN APU BAY. CLEANED GLYCOL OFF EXTERNAL DUCTING IN REF TO CRJ MM 21-51-00. NO OIL NOTED INSIDE ECS DUCTING OR HEAT EXCHANGERS.