Question
Hi... and thank you in advance for your time and advice.  Just under two years ago we had sod installed in our back yard.  When the landscaper was prepping he suggested that we change all of our sprinkler heads to "low gallonage"... which we did... because, well, hes the expert.  We had trouble from the very beginning.  The new sprinklers didnt work properly so the sod didnt get the water it needed in the beginning stages.  We tried and tried to get the landscaper back out... but with no luck.  Anyhow... we've been limping through since.  Its done fairly well for the most part, but theres always been patches that just wont seem to grow.  I've chalked that up the having two female dogs.  Recently we replaced the sprinkler heads and we were just certain that the lawn was FINALLY going to be thick and beautiful.  NOT THE CASE.  We had a long rain spell followed by sunny 80-90 days. The lawn almost immediatly turned yellow (even in places that had always done very well before). At this point I'm getting desperate because we're having our wedding reception here at home this coming September.  We've spent a ton of money wrapping up little projects around our property to make sure that everything looks wonderful.... but now the lawn is really declining.  CAN YOU PLEASE OFFER SOME ADVICE?  
Having posted questions before... I know that you'll need some information... so here goes.

We live in Northern CA. The lawn is nearly full sun.  The sod that was installed is Kentucky Blue.  We have about 3000 sq feet and 6 pop-up sprinklers that we've set to cover the entire yard.  Our waterting schedule is 45min per side (run left side then right side due to water pressure) 6 nights a week.  We water at about 4am.  I've been told recently that we're severly overwatering... and that the root system is very short.  I've spent hundereds of dollars having a local pest control company out numerous times for fertilizing and such (but honestly it hasnt seemed to help a bit).  

Answer
Becky,

Thank you for providing me with all the good information.  So many times folks write and say they have dead grass and expect me to be able to help them.  Had you not told me your watering schedule I might have thought this was something else.

I am reminded of one of my favorite saying in turf.  You are making "Holy Grass".  Know how to make "Holy Grass"?  Water the you know what out of it.  

Cut your water down to 15 minutes 3 times a week.  This may still be too much.  You may even consider cutting back to every three days.  Yout time is good though.  The earlier the better.  

Any fertilizer you have applied to your lawn is likely gone now due to leaching.  I would be caucious of any company that charges you hundreds of dollars to fertilize 3000 sq feet.  A 50 lb bag of a slow release fertilize with around 20% Nitrogen will treat 10,000 feet of lawn for a month...  Continue to fertilize and cut your water back, you will be amazed at the difference.  Also, make sure you are cutting your lawn at least 3" tall.

Good lcuk and please keep me updated on the progress.  

Turfnut2