Hi, I have a friend Sx850 which was going in protection after warm up. I read around and I went ahead replacing Q1, Q2, Q3, Q4 in the power amp board with matched pairs. The issue did not go away. So before to move to the power supply while I was at the power amp I decided to replace the electrolytic capacitors on that board. After power up I think I shorted something, there was smoke on the left side of the board. I think I shorted some components with the metal plate that goes between power amp board and output transistors frame. My bad! So now the unit is in protection. I checked all the output transistors and are fine, so are the resistors that got a bit toasted. Voltages are fine on the board except that between terminals 10 and 9 I have -26v Any idea about where to look next? Thanks!