Well it doesn't look like the thermal fuse you posted a picture of, it says s3 um1 250v 1a 130 degrees C and it's black.
I can confirm that the primary is dead also, as bypassing the PTC device (which protects the transformer against over temperature in the event of a short circuit or overload condition) also shows the primary is dead.
The first capacitor after the first rectifier is 50V. There is another smaller transformer on the board, which I assume the other rectifier is used for.
Hotwaterwizard, your suggestion that it could be CID, D&D or DD seems plausable, if you turn it on it's side it could be PD or ED perhaps?