Fixing a completely dead Nest thermostat heat link

.Spoiler - it wasn't a capacitor.
If attempting a repair like this then take extra care to ensure the power is off to the PCB. It has a lot of exposed live tracks on it.
Do you remember when thermostats were cheap, simple and lasted for over 30 years? Welcome to the future where they are expensive, crammed with electronics and may not last a tenth of that.
I think this one managed to scrape by its one year warranty period before ceasing to sense.
I would categorise my test-bodge as a temporary measure to identify the fault. It would be better to get the proper component, although it's not an easy one to desolder. It may require more aggressive heat pen use and probably some careful masking with Kapton tape to protect adjacent components.
In use the unit seems to run pretty cool. The two hottest components visible to the thermal camera were the PSU diode and the PSU primary side MOSFET, and neither of them was particularly hot.
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