prod. sys. transformations global decl. deleted. how track TP from E071 Tab

Hi SAP BI/BW Techines .

please help me on the following issue.

"In production system in one of the transformations global declaration has been deleted. we are not able to track the TP by which this has been done by using E071 table. can any one guide us how to track how our transformations has been changed in production in over night . "

I will reward points for any possible help .

Thanks

Alok