Make sure you have enough light to work with.
Sagging garage door opening.
To correct a sag in your garage door header you will need to reinforce it.
You can do this.
This opening system is one of the most popular options but it can manifest a problem.
Close the garage door.
Visually inspect the rollers and their brackets.
If you take the garage door measurements to a local lumberyard or hardware store they will be able to help you pick out the proper support beam for your situation.
If the tracks have become misaligned then it s not too difficult to fix them.
If your garage door opener uses a chain drive then it is probably like a lot of other garage doors.
This is to fix the fatigue and stren.
Using a ladder visually inspect both of the garage door tracks.
After closer inspection i found a fatigue fracture in the steel.
Overall this gives the opener less power to open and close the door.
Garage door started sagging and popping this last week.
Over time the drive chain can loosen and create slack.
The tracks keep the garage door rollers in line.