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If your dryer squeals or squeaks, it's likely the idler pulley is worn. The belt is routed around the idler pulley. A good preventive maintenance project would be to replace both the Belt and Idler Pulley at the same time. Unplug the dryer and try to pin-point where the squealing is coming from. You can find all parts and diagrams on Sears PartsDirect: searspartsdirect.com/model/1knin5jpo9-000582/kenmore-41769042990-dryer-parts
Contact the manufacturer for manufacturer's warranty claims. If this is an extended warranty from Sears, call Sears Customer Service at 1.800.697.3277.