Appliance Repair Questions? Ask a Technician for Answers ASAP
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My name is***** will assist you with your appliance today.
I am sorry to hear you are having trouble with your appliance.
I understand how frustrating that can be. Hope we can resolved it quickly.
Please look the technical data here,it shows difference between the two model of Liftmaster.
You may try to look your parts here.
I can give general answer but I do hope this helps.
Please do not hesitate to ask any follow up questions,concerns or clarifications.
Try to see this link.
Hope it helps.
Honestly,It seems that your Lift master LYN300k is almost 20 yrs,we are hardly find it parts,