Chamberlain Powerdrive PD422D 1/2 HP Security Plus Screw Drive Garage Door Opener "garage door loose power" Questions

...Garage door opener. Recently we lost power to our home for a couple of days. The door functioned perfectly until after the power came back. The door opens and closes well. The problem is that the ...

garage Door Unit Lights no longer turn on. Bulbs are in working order. They have been checked. I wish to take apart the unit to see if wiring is loose or disconnected due to vibrations.Unit is Model #