In 15 years of running workshops doing wheels among other things I only ever saw one 727 NW brake, and I reckon from the state of it that had last been serviced 15 years previously!
The wheels themselves had drive keys as you might expect, and these keys aren't cheap. Many workshops never bother to look at them so when you overhaul the wheels and measure/NDT the keys per the CMM it's a fair bet that you'll reject some of the keys for wear or corrosion. When we did this not one customer wanted the keys replaced, they all opted to convert the wheel to an alternative P/N (basically just remove the keys).