Tech found compressor for back hallway not running. Found stake on connector for start capacitor rusted and fallen off. Tech repaired connection by replacing spade connector. Dual run capacitor is in specs. Start capacitor is in specs. Start capacitor and potential relay tested good after replacing failed spade connector. Compressor started without issue. Tech allowed system to stabilize and noticed superheat is low and subcooling is high. Tech suspects someone has slightly overcharged system with R22. There is a spent leak seal injector next to outdoor unit. System is back cooling. Tech recommended getting a replacement quote due to age and likelihood of R22 refrigerant leak.