@usmeeabdo use something like [https://www.youtube.com/watch?v=w2mLqKcrrmA|this video] for a complete teardown.
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@usmeeabdo there are two lead acid batteries that provide the backup power. There is a resettable fuse in the back, in case your issue is related to now coming on. To actually work on it, use something like [link|https://www.youtube.com/watch?v=w2mLqKcrrmA|this video] for a complete teardown. If you have any specific issues with your UPS let us know what those issues are. That way we can be more specific.