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If you take it apart you will likely find spark traces between some of the junctions on the circuit board, and/or breaks or burnt areas on the large wiper contacts. These can be cleaned up and repaired.
Can clean board tracings. Use a circuit board specific cleaner so as not to completely dissolve the adhesive properties. Once cleaned apply a thin coat of Vaseline/petrolatum ointment with your finger over the traces where the lever arm contacts during its sweep.
Can clean board tracings. Use a circuit board specific cleaner so as not to completely dissolve the adhesive properties. Once cleaned apply a thin coat of Vaseline/petrolatum ointment with your finger over the traces where the lever arm contacts during its sweep.
I'm not sure I would do that. The Achille's heel of this design is that the slider is exposed to atmospheric pollutants, i.e. dust. Vaseline + dust = grinding compound (and vaseline is a dielectric; if you wanted lubrication a conductive grease would be more appropriate). I think this is why the WSM specifically recommends against lubrication on the horn button wiper.