Garage door not operating correctly
If I've found the right documentation for your opener, it says the lights should be red for a good beam.  You should also get a set of flashes that indicate the fault after you press the button.  Three flashes are for a sensor fault.

https://www.linearproaccess.com/wp-content/uploads/LDO_user.pdf

Follow the troubleshooting steps in the doc to see if they help.