Soldering to this ribbon?
I tried with many scrap ribbons. Always the same thing, substrate foil melts before soldering melts. What are they using for soldering them, Wood's alloy?
I had a CMI Octagon (?Kalok with re-branding stickers?) with dying ribbon (similar thing as in this Seagate, pushed by front panel bracket), it was possible to fix it a different way. I located two broken tracks, exposed them and used a wire glued to parts above/below the exposed area. Before, I inserted a piece of paper folded few times under ribbon. Next, I applied a thin piece of plastic and another layer of glue to keep exposed part from oxidation as copper passivates. After securing with sticky tape, I pushed the cable again using bracket to maintain a nice pressure and keep contact. Risky method as there is no second chance after applying glue (and no way to check that it works), but this Octagon is still working nicely (except few bad sectors at the end trimmed with partition) in one of my XTs.