Rare 1980s MM Electronics Compressor Limiter

1980s MM Electronics Compressor Limiter

Only channel 1 works, channel 2 is dead, I'm not getting any sound out of it. It could be an easy fix like a bad connection somewhere but hard to tell. So it's basicaly a 1 channel compressor as it is.

Channel 1 works well and sounds very good.

Thank you!