Torque tension Straps are lifed from date of fitment, not date of construction.
Internal corrosion is said to be the problem.
Several cabs have been lost due to this corrosion and I seem to remember Bell where first to have the problem, losing a 212 off Norway and then introduced a Life.
Westland did not until losing a Gazelle and then a Lynx both with fatel consequences, when Main Rotor Blade parted company with Head.
john