The PM should provide itemized items of what was done.

Here's a https://www.irs.gov/businesses/cost-segregation-audit-technique-guide-chapter-4-principal-elements-of-a-quality-cost-segregation-study-and-report to the IRS website noting specific items that are included in the cost segregation study report. hmm, that website is a 404 error.  

I'm wondering how much specifics I need to include for each line item. 

After a $500 plumber bill I no longer wish to continue stressing out about this business; at the beginning (10 years ago) it was fun and challenging, now, after seen how we are the ogres (landlords in general), the outrageous government response with the eviction moratorium during Covid, the raise in taxes and insurance, service people who charge you more than a brain surgeon, the fact that this country is becoming dangerously socialist and the tenant drama I finally decided It is time to look elsewhere for investments.I just cannot find any information of what to do when I sell my properties.

Also, how old are your capex items? 

This is true for bonus depreciation items as well.  

Remember, the notion of amassing wealth without investing is a dangerous myth perpetuated by self-proclaimed experts.

RM is plenty robust to handle the items you mentioned.  

The biggest problem I see is that most of those items should have been itemized from the tenant deposit.

I am also doing a live in full renovation for a long term rental where I am project managing mechanical items and doing a lot of the interior renovations myself.