A little over 90 days later, the problem with unequal volume on the main left-right outputs on my Kemper Profiler has reappeared and will not go away.
Parker at Kemper Service says it sounds like a replacement analog board is in order.
Repairing my Kemper Profiler will cost $220 plus one-way shipping and cause 1-2 weeks of downtime.
Sure, the downtime's a bummer, but what can you do? Kemper Profilers aren't being repaired on every street corner, and in fairness neither are Bad Cats and Tone Kings /shrug
I suppose when the time comes, I'll rack up my trusty old Line 6 Pod Pro and carry on for a weekend or two in nostalgiac glory
For now, I'll run my Kemper Profiler in mono from the hotter output. If I need to be heard in stereo, I'll tell the engineers to twist the pan knob toward the weaker side, or I can use the fully functional 1/4" main outputs into a DI.