Dear Arun,
You can ask for every record / information available with the PA except those exempted under S. 8 and 9. Although, you can not ask the
PIO to create an information, which is not there. You can not ask the question "why", although you may obtain all the relevant record and find out your self as how and why a particular decision has been taken or a particular policy has been framed. As regards to the thread, you have quoted, I am of the view that the application was not drafted properly.
As regards to obtaining the service record of an employee, you can obtain the same from the
PIO of the department, where the record is located. Don't hesitate to file an application. If you happen to file an application with the wrong PA, then it is obligatory for that PA to transfer your application to the appropriate PA within a period of 5 days.