I have a 7600 Remington Game Master my fater bought me 20 years ago.The other day I went to go on a hunting trip and I was going to bring as a back up rifle,I opened the gun case and just about bald

the gun was covered in rust.It was only in the case for about a week and a half.
It is the worst case I have ever seen,the blueing is coming off,is there anything I can do?Can a gun smith help or fix?