you need some tools for this plus some safety common sense
1: multi meter
2: soldering iron
4: scrap wire
5: wire snips
6: new capacitors!
7: earphone jack
8: a drill and a 1/4 inch bit
Step 1: Inventory the caps to be replaced
Next, get a piece of paper to write down the values and voltages you need. I also wrote down conversions from microfarads to picofarads to help when i go to select the new ones. from what ive done research on and what the great people on this website have told me, the paper and wax capacitors are the ones that need to be changed, which is underneath the chassis. As far as the humming noise goes. that is the electrolytic capacitors in the power supply circuit, mine was located in a metal can on the top of the chassis which contains 3 capacitors inside it actually.
Make sure the radio is unplugged before you go poking at things! on most chassis, the metal case is the negative part. but while you're in there, look around and see if there is any burnt out parts or wires that need attention.