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Therer's no need for pb-blaster. You'll see how the switch works when you get it out. Simply press it on the work bench to push the ball in and do this at a rapid pace several times. Then check it with a multimeter to ensure it's working again. If this doesn't do it, a new one will be needed.
campoj2- The diff lock is a very simple system and your problem seems to be that the diff is NOT locking. The new switch you bought has nothing to do with this function, only to tell the diff lock ecu that the diff locked/unlocked. ToolsRus had a similar problem that turned out to be a broken wire near the locker motor. This sounds to be an area for you to check.
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