Finding the short in my receiver (AMP circuit)
When the power transistors attached to the heatsink shorted, normally all associated components such as the emitter resistor, base resistor, its base pre-driver transistor and the low ohmic resistors around it will go along too... 

Standard troubleshooting method for this type of amplifier is, after replaced all shorted transistors and all of the opened/partially burnt resistors, DONT apply power yet..!!

What you got to do is, temporarily cut the Vcc+ and Vcc- to the amplifier and insert a 22 ohms, 2Watts resistor in each of those power lines. Meaning, these resistors will limit any dangerous (transistor killing current) if some other fault still remains in the amp. If your amp is fault free, it will consumes only about  50mA (depends on bias strength) in its both power lines. You can verify this by measuring voltage across the resistor and divide by the resistance. Basic ohms law.

If the 22 ohm resistors heats up rapidly, it means there is cross current flowing through both power transistors.  If only one of your 22 ohm is heating up, there is a short from that power line to ground through some other component. 

Relatively, these type of amp is very easy to repair if you understand well about the symmetry of the positive and the negative sides of the amp.

Good luck.