You will find that to inspect the cables properly (internal corrosion etc) please read AC43.13-1b Par 7-149 page 7-328 figure 7-16. Cable inspection technique
To do this inspection properly the cables must be partially removed so the full length of the cable can be inspected. This is time consuming and therefore expensive. It is basically the same cost of replacing the cables in total and having peace of mind for the next 15 years.
Of course if you find a LAME who will do a flick and tick it will initially be far cheaper, but at what cost??????