Mine started to be intermittent as well. And you could revive it with a gentle tap on the alternator housing.

I got this kit: Alternator Rebuild Kit 2000-02 Tundra 3.4L w 80 Amp, 2000-04 Tacoma v6 – alternatorbrush.com

It really was only the brushes, but I messed up the diode pack removing the brushes (rust belt car that gets driven in the winter, rust never sleeps, SIGHHHHH) and ended up needing that as well.

Not sure why they put two loose brushes in the kit? I used the brush holder with the brushes installed. The bearings felt 100% perfect when I spun it, so I certainly didn't try replacing them.

Works perfectly again, hopefully I get another 250K out of it.

That's about as much attention a 'rebuilt' alternator gets, other than not dousing it in paint.