No, but if you find a source for these I would love to know about it! A 550c with both the PPC upgrade + original 040 plus Rev C PCMCIA cage sold on Yahoo Japan recently for over USD $1000. Other than that, I don't think I've seen any on eBay in the last couple years, and I've been looking. (I actually have one, but it's toast somehow ... the PB won't boot at all when it's installed.)
Congrats on getting the 550c, they are great and rare machines!
That transformer is epoxy resin dipped. Its fine.
and if I recall, I think it was the international version people were having issues in those thread. Jeez, I need to go digging for the threads.
If the transformer was bad, it would blow the fuse in short order. and destroy its accompanying chopper transistor.