Also the electrolytic capacitor behind the heatsink looks to be "bulging" slightly, so that is probably on its way out .
'Probably' not Jim, it's the reservoir capacitor, so will be high voltage and most likely only 85 degrees, you can't seem to buy 105 degree high voltage capacitors (at least not easily). I only mention the temperature, as people (like I did) will probably spend ages trying to find 105 degree ones.
However, those capacitors are
VERY commonly slightly bulged when new, and it's not usually a sign of failure. They are also basically only low frequency (100/120Hz), so don't suffer the same failures as the high frequency capacitors in the rest of the PSU.
If you're repairing a PSU, and you have an ESR meter, then it's always worth testing it while you're doing - but it's rare to find a faulty one as such. It's one of those
VERY unusual occasions where ESR doesn't matter much, but capacitance does - on the rare occasions they fail they go very low capacitance, or completely O/C - and depending on the exact circuit configuration this is often catastrophic to the rest of the PSU (although some seem to work pretty well, even with it completely O/C - usually just a faint hum bar).