Repair SAP2000 .sdb File

I have a single SAP2000 model saved as a .sdb file that refuses to open—the program immediately throws an error as soon as I try. I need someone experienced with SAP2000 file recovery to investigate the cause, repair the model, and return a version I can open without issues... (Budget: $10 - $30 USD, Jobs: Data Recovery, FEA / Structural Analysis)