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Diagnosed low refrigerant charge on Bosch heat pump unit. Performed nitrogen pressure test on unit and was able to discover small leak at suction inlet of condenser. The leak was addressed and tech vacuumed the unit down to 434 µm. Tech recharged the unit with 7.75 pounds of 410 a. Pressures were checked running in air-conditioning and heating. System is now back up to standard factory charge.