Help with CSU Academic Renewal

I’m wondering if anyone has had experience or success with academic renewal from a CSU. I am currently trying to prepare to file for academic renewal but have some questions.

The grades I’m planning on filing for were from 5 years ago and I lack substantial evidence from a 3rd party to prove extenuating circumstances occurred at that time.
On advice from an academic advisor at the CSU (SDSU) I was suggested that although I may not have proof from that time frame(5 years ago) that I could get diagnosed from a psychologist/psychiatrist now. If i can prove that the diagnosis now could have affected me during that time frame ( depression) then there is a possibility of the renewal being accepted.

If anyone has any ideas/suggestions/experience please help me out. Removing these grades will help my GPA out a ton and as a result help my transfer chances.