2 system A/C prepaid preventative maintenance. Left filter for the owner. Found both systems low on freon. The left system has a weak starter, both main switches is burnt/pitted. Will check next year of starter getting weaker then we will replace it. Installed compressor saver for both ac, added 2 lbs of Freon to left system and 1 lb of Freon to the right system. Added safety locks at the A/C connection port. Both system cooling at this time