Number isn't currently handy but his email which he answers quickly in my experience is
don.boyd@tiffinmotorhomes.com.
They do no pickup the mh. What they have done is to send out brand new seat covers already made. They also have sent out sofa, dinette etc covers. They then will usually authorize you to take it to an upholsterer of you choice if you can't do it yourself. You do have to ask for the service if you are too far to get to Red Bay. By emailing Don you have it all in writing.
Be sure to include your name, address, contact number, year and model of the coach, the complete VIN number. Be short and concise about what needs replacing and it is much better if you can include a couple of pictures. Don will ask for pictures anyway. That's why it is better to just go ahead and email him to start with.
Keep in mind the holiday so it may take a little longer for a response.