Which cap is the possibly bad one on a Mini?

[JayDee]

I checked the caps that I took off the boards with this cheap Multifunction Tester tool.

Three of them measure around 55µF, and the fourth around 108µF.

The replacements that I ordered measure around 173µF using this tool, despite being rated for 220µF.

Make of that what you will.

[Garnet]

That's approximately a 24% deviation from the capacitors ideal specification or a ~4% greater deviation than the capacitors tolerance. It would be better if you had used an LCR meter to test the capacitor's capacitance as a cheap MF Tester can be very inaccurate. If an LCR meter reported a 4% deviation from tolerance I would throw out that component.