I was in St Patrick's in 2009 with my sister. The priest there, Fr. Simon Almeida (fr_simona@hotmail.com), helped me find my brother's grave in the cemetery behind the church (St Sepulchre). I was in contact with him by email before I arrived and he was very helpful...found the records which are all intact. He got me a copy of the burial certificate and showed us the grave. I'm not sure if he is still at the church now.
My sister was baptised there in 1943 and she was able to get a copy of her baptismal certificate from the church office while we were there.

Address:
St Patrick's Cathedral
1-B Prince of Wales Drive
Pune Maharashtra 411 001
Phone:
+91 26360575 / 56208522
Email:
stpatrickspune@rediffmail.com
Website:
http://stpatrickspune.com/index.php

I'm sure that if you send them as much info as you have, they will be able to help you....they could't do enough for us. Good luck with your search. Let me know if there is anything else I can help with.

Christina