Hi,
You can contact Mr Shahid from MASHALLAH autos Faisal Town Lahore, he is expert of Prius and already replaced 2 Prius batteries, 1 Prius Hybrid Unit and many priuses Water Pumps and ABS (Brake Actuator) units. He will diagnose you prius for free.
Secondly Magic Motors in Model Town (Near PSO Pump) lahore. They are also equipped with latest equipment and can diagnose and fix any problem.