Arrived to find attic system not cooling properly. Found system low on charge R22. Scott has a leak in his evap coil in attic. He opted to charge system. Charged with 3 lbs R22 and tested operation. Pressures 72/185, SH 12F, ODDB 82F, IDDB 79F when I arrived, 17F deltaT, system back to cooling. Temp was 77F when I left. Scott knows his system is older and he will talk with the company when he sees fit.