I've replaced those cables on a SP-540i that was less than a year old. I've only ever had to replace them on SPi's and VS's strangely enough though. Let me know how you get on.
The problem is your trailing cables have failed. I've seen this a few times and only replaced a set today that were causing the same problem. It's not a difficult job but takes a while to do. The part number on Digi Supplies is…"