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LiftMaster 3240M 1/2 HP Garage won't open or close - trolley troubleshooting

I am having difficulty with the LiftMaster 3240M 1/2 HP. For some reason the garage door wont stay down. There is damage where the L arm connects to the garage door, is this likely the cause? Looking for any suggestions on how to fix this problem.. Thanks so much!

​​​​​​​https://youtu.be/dkrxlaEXKNw
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