the mower started skipping, and now narrowed down to only skips when the blades engaged, as if an electrical cutoff is occurring. if it nearly stalls, as soon as the blades are disengaged the Kohler engine is humming along fine. The engagement switch has 4 electrodes which were dirty and cleaned, but that did not make a difference. I see there are two fuses one 25 and one 30. Each looks fine, but does anyone have experience with this problem? Does it seem worth just trying fuse replacement?