Hi,
if you deleted psa request without making red status then its not possible to get the same request from source dso.
Assuming as your data flow in 3.x, So no way to load the request based option.
So as of you lost the records which you deleted at PSA.
Work around:
At DSO, thru request based, find the loaded records and download into excel.
Later by using repair full request with proper selections you can load them to psa/targets.
Thanks