Check the outlets on the French drain and look for blockage (leaves and debris) along the drain as well.

Soak up as much knowledge as you can on these forums, podcasts, webinars, YouTube, other outlets etc.

The current contractors he's contacted have only been interested in doing quick work (ie. outlet repairs, fans, changing toilets, etc.).

Hard to beat own financed rates if you are going that route but look for an outlet that fits your REI goals best

I often take an outlet tester to see if outlets are grounded or have been improperly replaced with 3 prong receptacles.

The flip was done beautifully for cosmetic purposes but subpar with other more expensive finishes, for example electrical outlets are all 3 prong but actual electrical is not updated and grounded.

Maybe change an outlet or fixture? 

They will cover the equipment, maintenance; and I provide the space, outlets/duct work and responsible for all utility fee.

Also found ungrounded outlets, weak foundation where they replaced the water main, rotting fascia, sealed electrical panel so it couldn't be inspected, mold and water stains on the ceiling (looked old), duct taped holes in the wall and window, and more.

For example, when one of Sara’s other projects had outlets that weren't working correctly, Sara ordered him to cover the nonworking outlets with blank plates.