The Managemylife web site is a good resource of information to find out what may be happening and what options are available to you. I'm sorry to hear about the difficulties with your Craftsman lawn tractor.
I did some research at Managemylife website and found these expert answers to a similar question that may help until your expert can respond. I have attached the link below so you can check it out. If you decide to schedule service, and have a qualified technician to assist you, I have attached the link to searshomeservices.com. I hope this will be useful until your expert can respond.