Have a few questions to ask. 1. Has your dealer installed the update kit on your deck? There is one available under warranty. 2. Can you remove the belt covers and post a few pics of the deck? I would like to see if you have the proper spring dampeners installed. Close ups would be the best. 3. Does the tensioner arm move freely? Please post the model and serial numbers off the black ID tag. In my opinion your dealer is giving you a line when talking about pine cones. Most often the belt will break before the springs. If we find you need the update kit, I would find another dealer, as you have a good unit but a lazy dealer.