It has the usual slight channel imbalance when raising the volume from zero but once both have kicked in fully the right is quieter & duller compared to the left.
Any thoughts?
If you have done all the usual things such as swapping speaker around, ensuring a mono source etc… then it’s probably time for a service?
As an aside, it looks like my own NAIT2 needs to go back to the mother ship as although serviced around 10 years ago and little used since, it has started distorting in one channel 
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Yeah it probably does, could need a new pot.