I have an 11 year old Sears 139.53640SRT Garage Door Opener. A few days ago, all of the remotes stopped operating the door, but it still works normally from the wall switch.

The vacation lock is not on, and I have tried resynching the remotes.

The unit has a 41A4315-6C logic board, and the LED is flashing four (4) times.

Does anyone know the flash codes for this board?

If the board has to be replaced (~$75) I will probably just buy a whole new unit (~$150).

Any advice or insight would be greatly appreciated.

Thank you in advance.