The following select statement will scan fn_dblog and construct the sp_repldone statement for each individual command in the log that is marked for replication. It converts PreviousLSN and CurrentLSN into the format used by sp_repldone parameters @xactid and @xact_segno. It may be helpful in your situation:

select 'EXEC sp_repldone

@xactid = 0x'+ left(cast([Previous LSN] as varchar(22)),8)+substring(cast([Previous LSN] as varchar(22)),10,8)+right(cast([Previous LSN] as varchar(22)),4)+

', @xact_segno = 0x'+left(cast([Current LSN] as varchar(22)),8)+substring(cast([Current LSN] as varchar(22)),10,8)+right(cast([Current LSN] as varchar(22)),4)+

', @numtrans = 0, @time = 0' as 'Commands'

from fn_dblog(null,null) where Operation ='LOP_COMMIT_XACT' and [Description] = 'REPLICATE'