Am. Jur. 2d is a legal treatise used in Law Schools and law offices to compare and contrast general legal theories. It is not a Primary Source of legal authority. The fact that you are asking about this source here just SCREAMS that you are a Law School Student who is not going to graduate. I am somewhat disappointed that you are incapable of evaluating and issue spotting a legal fact pattern independently. That is actually the whole point of law school; you are ultimately supposed to help your client when she walks in off the street with these facts. If you are as clueless as she, then why would you be worth more than a Paralegal who fills out forms?
The pattern presents crossover issues of Workers's Compensation/Negligent Maintenance/Product Liability/Spoliation of Evidence/Subrogation/Res Ipsa Loquitor. Now you can do your part and research EACH of the theories to determine how they interact. And do not ask us to do your homework again.
We give free general concepts to be helpful, but you should give ALL your facts to a licensed Attorney in your state before you RELY upon any legal advice.