In Litchfield Park, AZ: UPON ARRIVAL CYCLED UNIT INTO COOLING MODE. CHECKED FREON LEVELS AND NOTICED BELOW SPEC BUT NOT EMPTY . REMOVED COVER TO AIR HANDLER CONDENSER AND LINE SET . FOUND NO LEAK IN CONDENSER OR AIR HANDLER . NOTICED INSULTIBE DRENCHED IN OIL . TIGHTENED FLARE FITTINGS BEHIND LINE SET COVER . TESTED WITH SOAP BUBBLES AND NO LEAK PRESENT AFTER TIGHTENING. RECHARGED SYSTEM TO CORRECT SPEC AND IF PROBLEM RE OCCURS RECOMMEND REPLACING FLARE FITTINGS .