From the TamronVids YouTube Channel:
Watch the process of Tamron’s industry-leading 3-business day repair service. Tamron USA took dramatic steps to increase the number of repair technicians that work on photographic lenses as well as customer service staff. Internal systems were changed to accommodate the inspection of lenses received by noon of each day and route the lenses to the proper technician for expert repair. Repaired lenses are then given top priority in the distribution center to ensure the product is on its way back to the customer within the established guidelines.
B&H carries Tamron lenses.