Performed club cleaning rejuvenation on two ceiling Cassettes.check for error codes. There was no error codes present checked PCB board on areas of concern. Checked all electrical wiring connectors and harness are tight and secured. Checked air movement system is good. Washed filters and frame and dampers of the cassettes. Checked high voltage is tight and secured. Tested ran system, system is functioning as intended at the end of service. Customer stated air movement system had a humming noise I wasn't able to hear and there was no fault codes test air movement system, air movement system is functioning as intended.