This Maytag was super reliable for 17 years until yesterday.
I diagnosed a failed overload (414RFBYY, 3.40A rating, 130deg open temp) and swapped another, similar one (419PFBYY, 3.63A rating, 125deg open), which popped and smelled like magic smoke instantly. Compressor is Americold SF107-1 (it also says PN2935).

Diagnosis (from memory): Compressor terminals measure 5 ohms to common, 10 between start & run, no shorts to ground. Start relay doesn't rattle and provides continuity between all pins while cold. System pressure (obviously at rest) is ~50 PSI. Voltmeter reads reasonably close to 120V on the relevant leads (at rest, not measured while attempting to start). Hooking voltmeter to capacitor terminals makes the readings change over time.

I would have thought the overload would just trip & reset itself if the compressor was stuck, but I've got a pair of permanently open 4TM overload devices that tell me something is certainly wrong. What does this suggest?