We serviced this unit so it would be in nice shape and working perfectly for its next owner. Replaced battery. Cleaned and lubed pot. Cleaned jacks. Removed pads, opened and cleaned and lubed contacts. Reinstalled. Cleaned unit inside and out. Cleaned PCBs. Replaced tact switches so there wouldn't be any retriggering typical of other examples of this model. We also replaced 8 electrolytic capacitors in the power supply/power line as a preventative measure.