It can be opened and repaired
You have to unscrew the two screws under the rubber bumper near where the silver metal part meets the painted back end of the vacuum cleaner. No need to remove the back end of the vacuum.
To remove the bumpers, you have to pull them hard the unhook carefully from the keyhole slots in the picture above otherwise the knobs will tear off and the bumper won’t tightly refasten to the back of the cleaner. The G’s integrated cord winder is very similar to the cord winders inside on the L’s and later AF’s for anyone who has worked on those.
Most all parts of an Electrolux were designed to be serviceable except the main motor shaft bearing which was supposed to never need replacing, though machines whose main motor bearing that wears out after 20 plus years could in theory just be replaced if they were made replaceable, but usually those machines have so much wear on them all over, hose, attachments, etc, that by the time it would need a main motor bearing one is better off upgrading to a new entire machine I think was Electrolux’s philosophy on this, or the whole motor could be replaced.
Cordwinders on models pre 1205 are better in my opinion, and the really old ones on XXX,LX, And E’s and early AFs were the best and most still perform very well today. They are the smallest ones, in chrome, blue, or cream with a chrome strip. The newer ones on 1205 and forward seem to always have some sort of spool dragging issue once the plastic cover is installed and closed. You can hear it as the cord travels in and out and it slows down the speed of the cord and causes the cord to slow enough to engage the stop sometimes one or more times when recoiling. Not sure if there is a fix for this issue.