Noisy speed sensor??

[darrsi]

I fitted a new sensor and didn't put enough grease in. It made exactly the whine /whistling sound you seem to have. It needed a huge dollop of grease to shut it up.

Hopefully it is as simple as that, just second nature to me me now to grease the hell out of that area when it's apart.
Bearings still don't sound too ideal but always try the cheapest option first though.