I believe they replace slings, they offered to replace mine on 30 year old pvc patio recliner and offered to replace the wheels on the chairs but I didn't bring with me that day. I bought the parts. I don't know if they 'recover ' seat cushions but the very nice young lady there has a lot of knowledge and cost saving ideas & I am sure she would be helpful in finding replacement cushions or fabric.
I believe they are new furniture sales only.
Thanks! Your answer is awaiting moderation.