it's probably just brushes. i replaced mine when i did my last timing belt job. around 275k. they were close to done. if people would just replace brushes at every other timing belt they would likely never have an alternator failure. well maybe bearings. but mine had close to 300k now and it's still going. its so easy to change the brushes when doing the timing belt. its like one more bolt and the wiring connector.
good option but when buying reman don't you get new bearings? OEM reman is like $150 from lexus parts now or can buy direct from denso.