Turns out that after many years the batteries had simply gone dead.
How to change battery in garage door opener chamberlain.
Remove the battery compartment cover.
No lights no nothing.
To replace you garage door opener battery you will need only safety protection gloves and eye protection the replacement battery and a screw driver.
Open the light lens of the garage door opener.
How to change chamberlain garage door opener battery.
My garage door opener stopped working.
For more information about the chamberlain.
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