LOL. Even I could make money if I owned a casino. It's, literally, a license to print money. I recall visiting the Trump casino in Indio, CA (I live 50 miles from there), now named Spotlight 29. Not a lot of bells and whistles... and the slots are "tight". Yeah, how he couldn't pull that off...
Stiffed? Trump is not alone. I've had to "compel" a few businesses to "pay up". Pay up they did. Every cent.

How Trump got away with that...
Trump University? Yes, laughable. Likewise UOP, and other for-profit "institutions.
Maybe the Russian and German lenders offered better "terms"?
OK. Maybe not SO productive, but you have to give him credit for making things happen... He's a great American. (Yeah, lol, I'm baiting you).
BTW... the IMS... Tiptronic... anything to look for short of dismantling parts? Maybe newer looking gaskets or seals... wrench marks on bolts?
Have a great day! Cheers!