Somebody here might know something I don't, but I'll mention I've seen a lot of issues like this as a result of the owner being the owner.
People put candles, and other misc personal preference commodities on top of their electronics, as if it were just another piece of furniture.
You may have drippage from something the original owner had on top of the player.
I'd scrape it out to get at the resistor. I'll mention that it's possible that semiconductor on the heat sink shorted, and THAT'S why the resistor burned-up.
It's unusual for a resistor to burn-up by itself. Something probably went bad in the circuit, resulting in higher current through the resistor.
Good Luck. I'll be watching this post in case somebody else here KNOWS about that wax spot.
I picked this up free from someone who said it didn't work, got it home and at first the radio worked but now it all seems to have power but no sound output and the phono doesn't do anything at all. So I pulled the back and slid out The main board and see what might be a bad resistor covered in wax. Here is a pic. It might just be discolored but figured I would get an opinion. Why is it in the wax to begin with? Do I have to melt it to get to it? 
