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There are 4 allen-head screws that hold the amplifier assembly in - two on top and two on bottom. Remove these and the entire thing slides out the back. There is one fuse near the power switch and two on the power supply board inside. Be sure to use the correct value.
You likely have other parts blown as well, but Q3 (MJE15033) AND/OR r8 (1 OHM/0.5 Watt) are blown. I suspect that Q3 has a base-collector short and you will find several of the output transistors are fried as well Q4, Q5, Q15, Q16. I suspect that the Zeners D14, D25 may be blown.
When restarting this, put a 100 Watt lampin series with teh 120 volt power to limit current and avoid destroying freshly repaired parts due to a few bad ones not found.