On a four point inspection, are we to be reporting the presence of polybutylene riser lines that only extend from the cut off valves to the fixtures (faucets, toilets) & are not the hard plumbing lines behind the walls?
Were they included in the lawsuit as having problems?
Is it stamped as PB (PB2110 etc.)? There are pex supply lines being used that look like PB but aren’t - “Merflex” pex is one that comes to mind off the top of my head…
ETA: I don’t know if you’re required to report PB supply lines to Insurance Co.'s but if it is PB, I would definitely inform the homeowner & recommend replacement.
Don’t worry about the supply lines !
It the piping in the wall that counts.
No. I might wonder why a metal connector was used with PVC though. 
We list main supply lines and fixture supply lines seperatly and let the insurance company figure out what they will accept.