I had the exact same problem. Turned out the pop-up drains in the lawn were covered over with grass. Once I found them I removed to raise these up and found LOTS of grass routs had intruded into the pipes in this area. I took several minutes of hand digging to remove roots and clean out the pipes. Working much better now.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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