Power Amplifier Repair: No Sound Issue -- 2

I have a power amplifier that's not producing any sound. I've already checked the cables and connections but the issue persists. I'm looking for an electronic engineer with experience in diagnosing and fixing power amplifiers. Ideally, you should have a strong background in circuit analysis and repair, and be skilled in troubleshooting transistors and ICs. Please message me if you're interested in helping me restore my amplifier to full functionality.