MSC tuneup and furnace service call. Furnace was not operating to do it today due to a bad igniter. I was able to replace the igniter in the system is up and running. Air conditioning system is starting to show its age. Blower motor capacitor showing 20% drop. Outdoor capacitor showing 5% drop. Outdoor condenser was very dirty. I sprayed off condenser. Temperature split is too high at 27°Indicating there is a problem with the refrigerant. This coupled with the weak capacitor puts unit prone to freezing. Would recommend replacing entire air conditioning system.