Not much you can do I reckon, damage to berries is not reversible, except to make sure that when harvesting, damaged berries are separated from healthy ones so that no tainting of the latter occurs.

Here’s a piece on damage, from a leading expert:

http://www.redepeabirus.com.br/redes/form/post?topico_id=97985

You cannot reverse damage to berries :)

Peter Baker thank you for your comment, greatly appreciated.

Andrew Paul McKenzie Pegman thank you for your comment.