Hi Charles,
For as far as I know, there are no revisions or newer versions of the service manual. So still no remarks on the cables... If I'm not mistaken, the 51-1 Junior service manual prescribes replacement after 1000 hours of flight. So, after 1200 hours we felt the time was right to replace our Puchacz' rudder cables last winter, although the (visible) state of the cables didn't urge it. It was a nice job to keep us off the street for another day though...

(and much more fun than replacing the main bulkhead)
Greetings,