How to re-construct PFS page in corrupted database

Hi All,

I am troubleshooting one database in which some pages are corrupted. As Paul say we can re-construct the PFS_PAGE( please refer the below url), could you tell me step by step please how to re-reconstruct PFS pages?

http://blogs.msdn.com/b/sqlserverstorageengine/archive/2007/02/04/checkdb-part-8-did-repair-fix-everything.aspx

My database is online and in multi user mode but if we query the data which belongs to corrupted pages, then it give error. Until we fix PFS_Page, we can't run DBCC with allow_data_loss or rebuild option.I am getting below error If I run DBCC CHECKDB with ALLOW_DATA_LOSS or REBUILD:

Msg 8946, Level 16, State 12, Line 1

Table error: Allocation page (1:2329344) has invalid PFS_PAGE page header values. Type is 0. Check type, alloc unit ID and page ID on the page.

Please tell me how can I take fix it? 

Thanks in Advance!!

Vikas