The inspection can be as little as disconnecting the turn buckles
inspect
reattach, adjust and safety wire. Some filing if needed. A stop bolt
replace.
etc.
With four different Modifications Replacement is unlikely.
Serv Bulletin # 26 is the killer unless you column is 415-52118 the dyetest. And every 5 years, but not many do. It is dated 1/12/79 don't find an AD for it?
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