Depending on the oak cabinets condition if they have zero damage they can be restained if needed (same for the cabinets in the bathrooms).You or a handyman can repair a chipped porcelain tub:  https://homeguides.sfgate.com/repair-chipped-porcelain-tub-25470.htmlDefinitely a new door on the standing shower.

Plus if you get a bad tenant they can do 5k in damage no problem.  

Or pay 20% down, lower my mortgage, eliminate PMI, and increase cash flow with no prospect for future rental property within a few years?

Turnkey companies that have experience and a good track record should never warranty tenant caused damage.

I was thinking of asking for a key or having the unit owner sign a document releasing me from any liability or damage that is caused by my inability to access the utility room.  

Banning them altogether is concerning, said Debra Carlton, senior vice president of public affairs for the California Apartment Association.Through a background check, a landlord might be able to weed out a prospective renter with prior domestic violence convictions, for example, and prevent him or her from moving into an apartment near a victim, Carlton said.

Read the fine print in the foundation repair contract: Damages to the property, interior and exterior as a result of the foundation movement are not covered, during and after works completion.

Be sure there is no damage and like @Justin Fox said, if the neighborhood can't support your improvements then don't do it.

During the last visit we noticed some damages that were not visible previously. 

Our goal is to decrease vacancy time and self-showing technology eliminates the back and forth of scheduling which has proven to get more prospective tenants in the door and rent the units faster.