Issues with foot controller - Pittbull 45 1 x12 Combo

Recently purchased a Pittbull combo from the Newbury Park era and love the amp. Having issues with the foot controller, though. Reverb and Effects switches work well, but getting nothing from either the Boost or Channel switches. Any help or suggestions?

Hey @MattK

Does this thread help at all?

Could there be an issue with the cable or connector?