You just need a slight "color coat".

I got one coat on both bathrooms and am getting the trim prepared.

They have held up well for us for 14 years raising three kids.The sides of the drawers are coated steel, the cabinet facings are solid oak with oak plywood insets.

Same for those who smoke inside, I take it off their deposit, because honestly I have to put a fresh coat of paint to cover up the "yellow" on the walls.

Good fresh coat of paint on the walls, ceiling and baseboards makes a difference of renting it sooner and getting higher rent.I got my contractor painting two houses inside and out and laying tiles throughout both houses. 

Say 7%.Our house coat $130,000 to build in 2001.  

If you're looking to diversify outside of real estate or trying to find ways to capitalize on your education I would check out white coat investor.

3 coats of Kilz oil based primer will cover anything that I know of.

On the other end of that connecter there should be Flame Sensor, looks like a small dia. rod, may have a 45* bend in it, unscrew it and clean the yellow brown coating off of it with any abrasive.

It's really old and tired looking.It's apparent that the cabinets have about 20 coats of paint on them.