What was found
LOUD HOWLING NOISE HEARD UP AND BEHIND MED CREW. ODOR OF BURNING PLASTIC PRESENT. REMOVED THE A/C COMPRESSOR AND INSTALLED SERVICEABLE A/C COMPRESSOR. SERVICED THE AIR CONDITIONER SYSTEM. REPLACED AFT EVAPORATOR RELAY, A/C CONTROL RELAY, AND CONDENSOR COMPRESSOR RELAY. REPLACED 3 SPADE CONNECTORS AT THE RELAY CONNECTIONS DUE TO MELTED PLASTIC. WORK COMPLETED IAW EC-270M AND DRAWING EC-856. OPS CHECKED. COMPRESSOR CONTINUES TO CYCLE ON AND OFF REPETITIVELY. CYCLING WAS FOUND TO BE WITHIN LIMITS. ISSUE CLEARED.