I have replaced capacitors on several boards to bring them back to life. If any of the capacitors on the board are puffed up on top or are leaking; then that's the problem.
Just read the side of the capacitor to get the type and ohms. I get mine from mcm electronics. They carry a wide selection and good prices.
You un-solder the old one. Note the orientation before removing, that determines the +\- side. Solder in the new one.
That should do it. Most times there was more than one that popped. Check the board carefully. Good luck.