@JBHorne Years ago, I had a tree growing next to my lawn. Over time, the area of the grass near the shade of the tree started to have problems, and eventually not grow. My landscaper said it was a common problem, and it seems consistent with what I see throughout the neighborhood. I've long since removed the tree for that reason, and as it was planted too close to the house anyway. Anyhow, from looking at the pictures shade looks to be the issue that you have in front.
Sorry for the bad news, but that's my take. I'm no expert of course. For the back yard lawn, what percentage of the day would you say you had shade ? From the article:
If you feel that the far back area gets enough sun, I would guess that you're not getting the same amount of water on that area as the rest. When it's running, is there any overspray at the borders, or does it barely get there. Does the water from one head reach the ones adjacent to it ? The real test is a catch cup test, but as you clearly stated you're fine with hiring this kinda stuff out. I almost contracted it out myself, so I did poke around a bit. When they told me there would be a min. $100 charge I went the DIY route.
Anyway, look up 'Chandler Irrigation Audit', or something similar. I found this one, but it looks like they are for commercial properties. Take a look at the video on their home page to see exactly what I'm talking about.
You might call them, and if they don't do residential I would think they could refer you to someone that does. You might also contact Ewing Irrigation in Chandler. Ask them if they know somebody that does irrigation audits.
You have some nice shrubbery. I'd recommend having your landscaper pull the dead parts, and also follow this procedure to make sure that your current schedule for anything emitter based is as it should be.
I hope this helps.