Seek advice on Sears (Silvertone) SS 40XL Model #257 14222000. I have worked on tube amps but not SS amps. Assuming loud hiss on both channels caused by failing transistors and will need to replace all. I will also need to replace the electrolytic caps including the filter cap can. Besides the hiss, the amp does amplify and I can hear that the reverb & tremolo are functioning. The schematic link on the previous discussion on this amp no longer works and can't find the schematic elsewhere. Any advice appreciated on finding the schematic, where to source correct replacement transistors and if I need to replace all the transistors. Thanks!