Yesterday I began to hear some noises from my spindle motor - a high frequency "whining" or "whistling", it's intermittent and varies depending on speed. So I suspect the bearing - how easy are those to change yourself? It's an Omio X8-2200L-USB:
https://www.omiocnc.com/media/catalo...00l_main04.jpg
I have some skills in mechanics and have repaired/refurbished motor parts as generators, starting motors, distributors etc. but I recon this is a level above.