I performed a winter time tune up on three Amana Heat pump units. While checking the unit that serves the downstairs bedroom I heard the contactor that controls the heat strips making a buzzing noise. I will order a new heat strip kit for that system and once the part arrives the office will call to schedule a time and day to have the part replaced. This is covered under the 10 year parts and labor warranty. View visual findings from this job here - https://visionshare.xoi.io/?id=XA-C794-8482F46331C6434394733445480A7D5C