@Keto
They still sell Toshiba 2290's at RF parts for $115 each plus shipping .
@575nightrider
As for the stamp and number that may have been on it that guy prolly used rubbing alcohol to remove it to make it look new. I'm happy you alcohol tested it and I'm glad its an original 2290.
That 2290 is the original. I can almost guarantee it from the looks of the glue on the screws being untouched.
There's got to be an issue in the PA section which is all those capacitors around and including the 3 copper coils. Try if you can when your feeling better or up to it to get as good a look as your can to the 2 green capacitors between the 3 coils for burn marks. Or any of them around that area and let me know if you find something please.