Power Chorus with no chorus

[cejay825]

just picked up a red knob power chorus, everything sounds great except th chorus doesn't work. Took the chassis out to find that the rate pot has been changed out.when turning the chorus on you can hear what sounds like a tone change but no chorus effect and an intermittent static,interference and popping. really bummed out, what should i check for.

[Enzo]

First, are both speakers making sound?