Customer stated unit is making high pitched squealing noise. Based off what customer is describing it sounds like there is an air leak somewhere. Turned ac and furnace on to see if I could hear noise but system didn’t make noise. Bottom door of unit has broken clips due to previous company and is just tapped on. Took door off to make sure it was completely sealed. Tapped door back up. Let customers know we would look into possibly getting new clips so door can seal properly. Told customer areas to look if noise ends up happening again and to give us a call.