Have you read this old thread?:
Unfortunately most of the input there seems to be about the failure of the capacitor and fuse, but not a diode.
It’s also worth noting the reply from Sonos staff on page 2 of that thread - if you contact them about it, they may be able to replace the whole unit at a cost, even outside warranty.
pEdit: try not to pay much attention to the speculation in that thread about “houses burning down” - all components in that area will be made from self-extinguishing materials, so the actual risk of fire from a failure like that should be very low.]
Thanks Antifon for your reply.
will look for it. Thanks!