FOUND EVAPORATOR COILS FROZEN UPON ARRIVAL DUE TO EXTREMELY LOW REFRIGERANT CHARGE. PICKED UP LEAK WITHIN EVAPORATOR COIL. OILY SUBSTANCE WITHIN COMPRESSOR COMPARTMENT AS WELL, BUT UNABLE TO LOCATE ANY LEAKS. COMPRESSOR RATTLING AS WELL MAY BE DAMAGED DUE TO RUNNING STARVED OF REFRIGERANT. OUT OF WARRANTY SYSTEM. HANDED OVER TO FIELD SUPERVISOR. COLLECTED VIA PHONE.