What was found
ORD - FLT 366 - DURING CLIMB-OUT, FLIGHT ATTENDANT REPORTED A STRONG HOT BURNING METAL SMELL IN AFT COACH CABIN. FLIGHT AIR INTERRUPTED AND RETURNED ORD WITHOUT FURTHER INCIDENT. BURNIG SMELL DISSIPATED WHEN AIRCRAFT LANDED. MAINTENANCE TROUBLE SHOT SYSTEM UNABLE TO DUPLICATE SMELL. AS A PRECAUTIONARY, MAINTENANCE REMOVED AND REPLCED COALESCER BAGS AND PERFORMED PACK BURN OUT PER THE MM. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)