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Found Mitsubishi mini split system low on charge. Found system running at 18 psi 410a. Also found some oil at outdoor flare nut. Need to return and perform a complete leak search analyst on mini spli system with nitrogen and repair joints thatn are leaking. Also performed precision tune up on both systems. Cleaned both systems washable filters. Blew out condensate drain and tested pump on basement air handler. Checked all electrical conections and components. Checked refrigerant pressures and temperatures at indoor and outdoor unit.