When you find a suspect electrolytic capacitor, test it. If it is okay, solder it back in the same orientation. If it is bad, replace it with another with the same capacitance and voltage rating.

How do you test it? Some multimeters have a "Capacitance" setting. If like me yours does not, you can still proceed with the test. Switch your multimeter to DC volts. Attach the red probe to the "+" terminal of the capacitor. Attach the black probe to the "-" terminal.

Next, use alligator clips to connect a 9-volt battery to the capacitor, again observing polarity: the "+" battery terminal goes to the "+" terminal on the capacitor, and the "-" terminal on the battery goes to "-" on the capacitor.

Carefully note how long it takes the capacitor to charge up to 9 volts.

Disconnect the battery and note how long it takes the capacitor to discharge. Compare the charge and discharge times to a known good capacitor with identical specifications. If there is a significant difference in charge or discharge time, then replace the capacitor.

In my case, the old capacitor discharged twenty times faster than a new one. I concluded that the receiver's problem was a bad capacitor.

Your unit may have a bad diode, transistor, or something else. Search the web for a guide on how to test each type of component.