Interesting Contamination Does Not Automatically Establish Root Cause

What the evidence preview establishes

Sulfur in the seal, titanium on the silicone coating, and trace chloride were not connected to a functional fault. No gross component or EOS damage was found, so electrical fault isolation was still required.

Why this case matters

Do not promote every unusual residue to root cause. First locate the electrical fault, then test whether the observed chemistry lies on a credible path to that fault and distinguish service evidence from disassembly artifacts.