Today I noticed typical 2” conduit with significant discoloration only on the two 90 degree elbows. The elbows feed almost directly into the main panel.
Is this heat damage? There is no water leaking onto this area and the coupling in this photo shows signs of some deformities, as if it has become malleable at time (no longer perfectly round).
Anyway, all I can think is that the SEC as damaged when being pulled through these elbows and now they’re overheating or arcing inside there. Service was installed in 2004.