With the green indicator LED having failed at a weak point I had to make up a new one and address the weak point.
The wires that came attached to the LED were very thin and the crimp point of the connector had focused the stress of any movement onto a single point.
To provide additional reinforcement at this point I covered the wires with two layers of shrink wrap before crimping the connectors and soldering the wires.
The resulting assembly was much more robust and survived fitting with no issues.