Gemini CDM-3700G Professional Dual CD Mixing Console Karaoke For Parts Not Working Untested

Powers on and when I put in a disc it seems to read it. Disc tray was getting stuck but I removed some dust and closes better now but probably needs more cleaning unit is very dusty. One of the knobs at the top is broken and one of the sliders is missing and another slider is missing the holders to move it. Selling for parts as is. Could be other issues I don’t know about or see.