Well for starters try opening it up and see if any of the wires have come loose. A little solder, flux and soldering iron will work wonders. Next double check that switch with a multimeter on ohms, it should read as an open when it is not in AM and should go to 0 when closed. Check all the connections to the switch and see that they are tight. someone could have dropped it and broken something inside.
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If ignorance is bliss, then wipe this smile off my face!
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