i would also replace the two big transistors on the heatsink, which are 2SA1492 and 2SC3856. also replace the two big ceramic resistors and the small blue resistors that look burned.
you need to replace the parts in the blue circles
correction, after looking closer one of the blue circles is around a green mylar cap, you shouldn't need to replace that, but there's a burned blue resistor somewhere near it that needs to be replaced... maybe next to the larger blue resistor that's next to the right-hand white resistor. in any case, the output devices, the white resistors, and the blue resistors that go to pin 1 of the output transistors, should all be replaced.