Water Pump Issue - Any ideas on accessing the PEX behind the toilet?

I have a 2019 [email protected] 320s Boondock Edge with water pump issues. The system runs fine on city water. I have disconnected the water pump intake hose and put it into a bucket and the pump is sucking water through the pump. This leads me to believe I have air entering the system somewhere on the intake side of the pump.

I had to replace the sink last summer and know that the PEX moved around a lot during this repair.

Thanks to earlier posters I have a photo of the wall behind the toilet.

Any ideas on how best to find the air leak short of cutting a hole in the wall?


2019 320s Boondock Edge
TV is 2007 Kia Sorento EX with 3.8L engine


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