Your Kenmore Elite dishwasher was made in March 2014. Your model has a lifetime warranty on the stainless steel tub, see page 3 of your owners manual.
You can find parts, diagrams, and your owners manual on Sears PartsDirect: searspartsdirect.com/model/4hr0sf90n2-000583/kenmore-elite-66512773k311-dishwasher-parts
Dishwasher DIY repair guides and error codes: searspartsdirect.com/diy/dishwasher-repair/1234583
For repair, call Sears Home Services at 1-800-4-MY-HOME.
This is the current equivalent Kenmore Elite model: sears.com/kenmore-elite-24inch-built-in-dishwasher-stainless-steel/p-02214793000P?sellerId=SEARS
All dishwashers: sears.com/appliances-dishwashers/b-1020017?searsTab=true
Hope this helps!