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Quad Gem DMX L747 Message

I’ve had my unit for 10 years and after 112 hours of use, it’s been rendered useless.  When I turn it on, all the lights come on and then the L747 message appears on the led board and the unit locks up.  I love this light and have really enjoyed having it as a part of my light show.  I’m a mobile DJ and would love to have there light back working again.   Please help!  

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