Greetings guys!

So my powerliftgate finally stopped working. Already checked minor possible causes including slamming the lower gate to no avail. The red open/close button is not lit but when pressed it still activates (clicks) the latch. The 2 liftgate fuse are both good, unless there's another one I do not know I missed researching online.
Does this mean the power struts (spindles) need to be replaced? And if it is, is there a novice way to figure out which side?

Thanks!