Dear Bristol Landlord:
I am an attorney licensed to practice law in New York. I do not practice law in Pennsylvania.
You really need a lawyer, as you are not certain of your rights as a landlord, and you did not look at the lease to confirm your landlord rights and responsibilities.
So you may begin the process of becoming a client by reviewing information about the landlord and tenant eviction process in Pennsylvania:
Read the Q & A in this article, even though written from the point of view of a court in Philadelphia, the general discussions about a landlord's rights and strategies (such as needing to provide notice or no notice if the lease provides) and the steps needed to bring about a final determination and eviction, would apply throughout the state:
The answer provided to you is in the nature of general information. The general proposition being that you should try to avoid a bad outcome if you can.