Performed AC maintenance on main house AC and sunroom AC. Checked amperage draw on both indoor blower motors and outdoor compressors and all are within safe operating range. Checked both outdoor capacitors and the one for the sunroom was reading low and was really rusty so I replaced with a new 40+1 capacitor. Changed merv 16 filter in main house system and 16x25x1 filter on sunroom system. Cleared both condensate drains and they are both draining properly. Investigated noise in sunroom and it isn’t making any noise upon my arrival. It could have been a possible twig that fell in the condenser fan motor blade or vibrating from the line set in basement that the customer heard. It is NOT making that sound as of now. Re-leveled sunroom condenser with rubber pads because it was leaning towards the house. Tested and cycled both systems and they are both operating properly at this time.