Is this Bad Capacitor repairable on this power supply?
That tan colored buildup is a 'hot glue' and for hotter temps than regular hot glue. You can also see the glue holding down the inductor. 

Usually capacitors will exhibit corrosion or a bulge when defective, it usually comes out from the top or bottom on electrolytic capacitors. The capacitors look fine from the pics shown above. Here is what a bad cap looks like:


Source: https://www.robotroom.com/Faulty-Capacitors-1.html

Sometimes they also look like a firecracker (literally) if they have exploded. 

If you really think the capacitors are bad get an ESR meter, and desolder the capacitors and measure the ESR for those capacitors. I would estimate that the ESR for a cap that size should be below 1Ω  

If the supply isn't at the right DC voltage, it's probably a feedback problem with the controller. If the supply has too much AC ripple, then its more likely that you have a bad capacitor.