A roar that gets louder as speed increases can be related to support or drive components. The sound alone does not confirm that the bearings need to be replaced.
Distinguish roaring from knocking
Describe whether the noise is continuous and follows the speed or whether it comes as separate impacts. It also matters whether it started gradually, appeared after the appliance was moved, or matches visible play.
You do not need to repeat a high-speed spin to prove that the sound gets louder. Use observations already made and stop using the machine if it is accompanied by rubbing, shifting, or an abnormal drum position.
What manual rotation can show
With the washer unplugged and opened through the normal procedure, a gentle check may let you notice roughness if the design allows manual rotation. Do not force brakes or drive systems that are meant to offer normal resistance.
If the sound also appears under that condition, it points toward mechanical parts, but you still need to distinguish bearings, part-to-part contact, and drive mechanisms. If there is play or misalignment, describe it as a second symptom.
What the inspection should confirm
Bosch includes bearings and other internal elements among the possible causes in its help on washing machine noises. The technician needs to identify the wear point and the condition of the shaft, seals, and associated supports. The repair should not be chosen based on the comparison “it sounds like an airplane,” since different faults can sound similar.
Do not apply lubricants from the outside to silence a sealed bearing. Temporarily reducing the noise would not prove that the support is still in good condition.
Ask for identification of the component and the associated damage before agreeing to a bearing replacement based only on the sound.