Garage door wont close, Stops and Reverses, Voltage Test.

My garage door is not working correctly and closing only when I’m holding the control button down. When I release it, the door stops and reverses, and won’t close. The garage light flashes 10 times. How to troubleshoot voltage, and fix garage opener safety sensors if there is no orange and green light on LiftMaster by Chamberlain. If the green light is blinking, align sensors or remove any obstructions.