Every individual who has been born in this borth is a reflection of his past deeds. We carry a lot of debt (karma vinai) and one must complete all our Karmas as per our destiny before we attain Mukthi.
In this continuous sojourn of birth and death, one must perform a number of remedial practices to absolve ourselves from the past sins.
I will mention as many temples as possible which are referred by the learned Gurus where various remedial rituals can be performed.
Pitru Karyas - Devipatnam