I am looking at a plane that had a gear up belly landing 13 years ago. Seller passed away and trustee sent me the 337 forms and repairs done by replace engine and prop. Would you buy a plane with past major damage history if the prebuy checks out? How much value would you discount for past damage history? I've heard between 5-20% based on damage and how long ago it occurred. Most of the older 30+ year aircraft have had gear up landings from what I see.