Doepfer

Hey everybody! I'm just filling my first modular rack and unfortunately I've already begun 
hitting a small snag. i bought a used 138-b linear mixer a few months ago and up until 
about 2 weeks ago it was working like a champ. It began with the output shorting out where 
I'd have to jiggle the cord to get it working again. I removed the module and inspected the 
back but i didn't see any loose or broken solder points. Just to be safe i tightened the jacks 
mounting nut on the front but it's still been acting shady. Tonight it finally went dead and 
now I'm getting no love! Not looking for a miracle, but maybe just some insight. 

Thanks in advance!!!!!