Arrived to remedy an inoperable air conditioning system. Upon inspection of the system found that the evaporator coil was cased in ice. Ran the furnace to thaw the ice from the system. Once coil was completely thawed, pulled the disconnect from the outside unit. Created a call for cooling. Made sure the furnace is doing its part for a cooling call. Went outside and connected gages. Fired the system up and found that the system is very low on refrigerant. Started getting ready for a leak search and found oil coating the condenser. Sprayed soap bubbles on the liquid line coming out of the compressor, and found a pinhole leak. Spoke with homeowner about repair solutions. With homeowners approval removed all refrigerant from the system. Purged with nitrogen while brazing. Pressure tested with nitrogen after brazing. Pumped system into a vacuum. Charged system to factory refrigerant levels.