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I’m upset

888LM not working

I have a Liftmaster garage door opener with a purple learn button. The 888LM is supposed to be compatible with this garage door opener. When I install the stock garage door panel the garage door opens and closes. If I install the 888LM the unit's lights do not come on and the garage door cannot be opened using it. It appears the unit has a faulty circuit board. I hope Liftmaster can offer some assistance or replace the board.
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