From you mileage and noise it does sound like a left wheel bearing, but these sounds are really tough to isolate. My symptoms were opposite of yours so I replaced the right bearing. (No fixy
) So I went to replace the left and found the inner CV joint was extra sloppy. I replaced the axle and wheel bearing and it's been amazingly quiet ever since.
The wheel bearings are sealed, which makes them more difficult to replace, but usually a noisy bearing will have some extra play or slop that you can feel. If the Mach. thought the bearings were OK, it could be a CV joint getting noisey. It'll last a long time just being noisy, so you can keep driving it until it gets noisy enough that you can tell better where the noise is coming from.
