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I think your tech may be right. I had a similar problem with my jd425, switch was worn and not making contact when in the run position.

Sounds like a similar problem I had with my JD Z425. Sometimes wouldn't start, sometimes randomly quit. Checked fuel pump, it was operating fine. I finally tracked the problem down to a defective ignition switch, it wasn't keeping the fuel solenoid operated. Replaced switch and everything...

I had a similar problem with my zero turn Z425 John Deere mower. I could hear the fuel solenoid click when I turned on the key, but it often would not start, or, would start and run for a couple of seconds and shut off. After chasing this one for over a week it turned out to be a worn out...