I wouldn't do it given that you have no indication of previous water intrusion. 

Assuming they allow you to inspect more intrusively, then you'll have the factual basis you need to ask for the reduction. 

I feel like that's maybe a little too intrusive for the type of property and tenant I hope to have. 

I had inspections on my first 2 property purchases but I've learned a lot since then and I never do them now because I'm now knowledgeable in foundations, roofing, termite damage, water intrusion, hvac systems.

On the other hand I would say over 70% of our clients do come and visit and want to see the physical home, the process form A-Z, we encourage it and I encourage investors on BP especially first time investors, put boots on the ground, visit the operator and be intrusive.

Not me and I don't do business with those using such intrusive tactics.

Water intrusion?

The latter would be better for your basement.We do not have a/c anywhere near the basements nor do we plan on it.The air infiltration in this old house is high but is something we can't correct so we live with it but the moisture is constant because of the basement geology (hand dug) & very large.This concept is obviously for old basements that have significant dampness due to water seepage/intrusion rather than simple humidity. 

In the end it will be less intrusive to abandon the defective line and install a new one in a location that it can be accessed in the future.

Apologies if this kind of post borders on 'asking for a mentor', but the thought of contacting individuals posting on the subject seemed more intrusive than making an open request.