Your dishwasher works on and on day after day, don't take it for granted. With a little TLC, it'll last far longer. Remove the front kick plate (to look for water leaks). Spotting trouble early is key here. Vacuum out dust, too -- especially around the motor. Check the spray heads inside. If they're clogged, clean them and soak them in vinegar, if needed.
Check the door gasket and, if it's hard or cracked, have Bug`s appliance Repair replace it!