Many Valley neighborhoods went up within a few years of each other, so disposals on the same street are often about the same age. When yours quits, the sorting runs the standard list. A hum without spin is usually a jam, the common, fixable one. A leak underneath is often the seals or the housing, and the contractor checks which. Silence usually points to electrical or motor, and hard water can add scale along the way.
Jams get cleared properly, with the right tool and a check of the aftermath, because a jam cleared by force can shorten a motor's life. Leaks get checked to see whether a seal can be replaced or the housing is near the end of its life. A silent unit gets a straight answer too.
When replacement is the right call, the new unit is sized to how the household actually cooks, chosen with the Valley's hard water in mind, and installed with the connections done properly. The recommendation comes in plain English with the reasons explained, and the decision is yours.