Tech arrived on site and did ac tune up. Condenser had been rebuilt. All electrical start components had been replaced and checked out. Fan motor was amping at max. While the unit was running. It tripped on the low pressure switch multiple times. Pressures confirmed the switch was good. After about the 4th time the unit pressures stabilized. Had an 18 degree split. Super heat was a little High. Indoor unit was okay. Blower had been replaced. Possibly the control board as well. Cap was new. Heating side looked old. Did not test this visit. Recommend budgeting for replacement soon as the unit is getting to replacement age.