By your descriptions it looks like your supply is working fine. It is
normal for some components to warm up and if it were faulty you would
see some problem with your supply. If it works, don't mess with it.

wrote:
I have just fixed an power supply by replacing a bulging capacitor.

The capacitor is connected to diode. And the diode becomes hot and
makes a black spot on the board since the faulty cap.

I check the diode with a multimeter and it tests great.

The repaired power supply( cap replaced) has been tested for several
hours and no problem yet.

Question: Is there any way to check whether the diode is working
100% ?

Thanks!