Estate Planning USA.com

We recently purchased a new home to use as a renter. Our real estate agent told us to purchase and insurance policy from Old Republic to cover anything that could be wrong with the house since it was built in the 80’s. An inspector looked at the house prior to our purchase and didn’t notice anything with the property. Once the house was occupied by our renter, he noticed that the lights would shut off and stay off for a few hours. Old republic sent an electrician over and he told us that the prior owner had replaced a new breaker on top of a broken buster. He reported back to old republic and they stated that the insurance didn’t cover anything that was not installed correctly. We were precise to inform our agent of the policy we needed for the house. We were not sure what work the house had done prior to our purchase so that is why we purchased the insurance. The policy we had was Old Republic Home Warranty Plan. That is what our agent advised us to get. Now, what can we legally do to help cover our out of the pocket expense of over a grand. Is there a policy that anyone would recommend for a rental house. Let me add that we do have home owners insurance but it only covers fires, floods, etc. (Please no unnecessary comments, this is an important question and need real honest advise.) Thank you in advance to all who respond and hopefully this could help others who read it as well.