Even in a kitchen built to La Jolla standards, a disposal wears out like any other, and when it quits, the likely causes are the same as anywhere. A hum without any spin is usually a jam, which is common and usually fixable. A leak underneath is often the seals or the housing and is judged case by case, with extra care for the cabinets, because a slow drip into fine woodwork can turn into a costly repair. Silence usually points to the electrical side or the motor, and a failed motor usually means a new unit rather than an expensive repair.
A jam gets cleared with the right tool, and the unit gets checked afterward. Leaks matter even more in La Jolla homes, because moisture damages fine cabinets, and catching a drip early protects everything around it. Taking 30 seconds once a month to look under the sink is one of the easiest ways to catch a small leak. If you do find moisture, the contractor finds the source and scopes the repair to what they actually find.
When a unit reaches the end of its life, the replacement is matched to how the household actually cooks, quiet models where quiet matters, installed with the connections done properly and tested. Each recommendation comes in plain English with the reasons explained, and every decision is yours to make in your own time.