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The Model 18 uses a switching power supply to generate +/-15V for the analog stages and +3.3V for the digital logic. If the smoothing capacitors on the +3.3V rail degrade (common in units manufactured between 2016-2019), the DSP chip receives "dirty" DC voltage. This causes the internal oscillator to glitch, landing on "Set 33" (a default null state) rather than booting properly.
So, likely meaning: Someone with a small repair agency fixed a Laney Model 18 amplifier by adjusting (or "setting") its channel/preset 33.
Have you performed this fix on your Laney Model 18? Share your results and photos in the comments below. For sourcing spring steel strips and PTFE tape, check the stickied Resource Thread.