Sounds like just about every conection is dirty, jiggle the wires at the limit switches while jogging the down switch. If something moves, you will probobly find a bad connection before you find a bad switch. If I had to start digging in I would check to see that we have power coming out of the dash mounted switch...then i would check to see it i had it out to the limits. A pointed test light with a sharp tip will poke through the wire insulation and read voltage. Remember...it is probobly somthing simple.
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