static noise

I have bought a used Music Fidelity A3 integrated amp today. But the volume doesnt work and there is static on the left channel. Apperantly the unit took a dive at some point but besides some dents to outside it seems very clean inside. Can anyone tell me how i might solve this please?

Hello guys, so today my cayin iha6 started to output static noise on the left channel of the 4pin balanced output. There is 0 audible noise on the unbalanced output. I am 99% sure the issue comes from the amp. I have tested on another power outlet without anything but the headphone connected...