Yeah, but the strange thing is that if a component is missing and not replaced with a wire there should be a break in the signal path = no sound (for that channel). On the photo it looks as if some of the solder joints of the resistors have been tampered with. Did you buy it second hand?
I bought it from David on eBay. Amp was shipped directly from China. I have never made any modifications to the circuit board myself. Many solder joints (most of them actually) do look messy.