Invalid page header in block 25561983 of relation pg_tblspc

Dear Expert,
I am getting the below error in my database.
ERROR: invalid page header in block 25561983 of relation pg_tblspc/55703433/PG_9.1_201105231/55703436/113490260

Can you please suggest me how to resolve it? I think its related to block corruption.
How can I find particular block in which table? And how to resolve that particular block issue.

Thanks in adwance

Regards,
Dinesh Chandra
|Database administrator (Oracle/PostgreSQL)| Cyient Ltd. Noida.
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