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liftmaster 8550 slow start/stop not working

I got installed a Liftmaster 8550 garage door opener early this year.  For some reason, the programmed travel was lost and I proceeded to perform the travel programming as per the User's guide procedure.  Once finished, the door was opening and closing to the defined limits.  Nevertheless, the slow stop is not working, and the goes constant speed and stops hard when opening and closing.  This is not how it used to work. 

 Is the an additional procedure to program this?  what can the problem be?

  I have researched on the internet on this issue and have not yet found a solution. 

HELP!
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