3 years of intermittent "Service 4WD" light. I pulled the dash and switch using no tools. I pryed the cover off the switch with a small flathead screwdriver. The posts looked fine to the naked eye, but under a microscope, the solder on the posts were definitely fatigued. A quick relfow with the solder gun was all that was needed. I put it back together and it works just fine! $0 spent and only 10 minutes of my time.
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