As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT INTO PHL, FLT ATTENDANTS REPORTED SMOKE IN CABIN. POM PROCEDURES FOLLOWED BUT WERE UNABLE TO DETERMINE SOURCE. FLT ATTENDANTS LATER REPORTED, SUSPECTED AN ELECTRICAL PROBLEM. TROUBLESHOT PACK SYSTEM AND ALL NORMAL. FOUND GASPER FAN POPPING C/B AND CAUSING SEVERE ELEC SMELL. REPLACED SAME.