What was found
FLIGHT 796, PHL-TLV - SHORTLY AFTER DEPARTURE THE FLIGHT CREW WAS ADVISED OF AN ODOR IN THE CABIN WHICH RESEMBLED A "HOT, ELECTRICAL" SMELL. THE ODOR DID NOT DISSIPATE, SO THE FLIGHT CREW CHOSE TO RETURN TO PHL AS A PRECAUTION. AN EMERGENCY WAS DECLARED AND THE FLIGHT LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE NR 1 ENGINE. INSPECTED THE LEFT HAND PACK AND REPLACED THE PRIMARY AND SECONDARY HEAT EXCHANGERS, ACM, AND PLENUM CHAMBER DUE TO CONTAMINATION.