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brown spots in pex tube with matching defects on exterior of tube

My radiant system is driven by Combicore boiler/domestic hot h2o. In service for 6mo. of heating. Both supply lines (two) show rust colored internal discoloration and there is raised defects on the outside of the tube (photos) matching the area of discoloration. Surface defects are only in the discolored areas. Defects occur randomly along the entire length of the tube from the copper boiler connection to the manifold. Different brand of tube past the manifold shows no such anomalies on the supply side in the 3 feet below the manifold prior to going into the floor. No anomalies exist anywhere on the return side. System is filled with softened domestic well water with no other additives.
As the defects run sporadically the length of the supply tube. As such I find it hard to believe that physical damage to the o2 barrier from "fishing" the pex is the issue. Defects occur both on the end of the tube run that was pulled and the end nearest the spool at install.
I would welcome your perspective as I fear the possibility of splits or pinholes coming from this anomaly going forward as this is a 6 month old system.
Thx,
M
As the defects run sporadically the length of the supply tube. As such I find it hard to believe that physical damage to the o2 barrier from "fishing" the pex is the issue. Defects occur both on the end of the tube run that was pulled and the end nearest the spool at install.
I would welcome your perspective as I fear the possibility of splits or pinholes coming from this anomaly going forward as this is a 6 month old system.
Thx,
M
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