Hmmm- Bert, I was told by a piano repair outfit that the soundboard couldn't be repaired, and the piano was toast. But that set me looking up the problem on the internet, and I found this from Steinway-

The soundboard

A new baby grand costs some $25,000 or more new. Other repair needed, of course, are the felts, etc. Maybe it is worth looking for a more knowledgeable repair outfit. I've got a relative who wants a good piano but is low on cash.