Share your experience!
Same problem here. When i get soundfrom the speaker, it sonds like it's broken, but most of the time i get nothing.
Did the repair, safemode and factory reset, but the problem is still there.
Your observations about the volum is correct.. did not think about it untill i read your post.
Had sound after the repair and the factory reset but only for a bit.
Wierd thing is after repair the start up sound (sony bootup tune) was perfect and no disturbances, but as soon as i do the diagnostics test or any other thing that uses the bottom speaker, the problem is back.