Only playing left audio

I just moved recently and have noticed that only the left audio is playing from the MPC2500. When hooked up through the 1/4" outputs in the back, only the left speaker plays. When I hookup headphones to the front, only the left headphone plays. I am running jjos 3.1 but I'm not sure if that's relevant or not. Anybody have any ideas what is going on?

Oi oi , sorry to read the bad news boss but I had a bit of a similar shitstorm with my master volume , which started as bleeding mono and ended with me having to repair it myself. You think there is a chance that the master may have been knocked? Do you get any bleed if you give it a wiggle?
Turns out my solder skills were not up to scratch , about to crack it open for a repeat , hope you get to the bottom of things.

I'm not sure what you mean by my "master may have been knocked" it sounds fine out of the right speaker, just need that left one goin again...