Welcome to the Forum
A couple questions:
1) is this a conventional EI or Toroidal 50/60 Hz mains transformer or a high frequency ferrite switching type?
In the second case you will NOT find commercial equivalents, since they are not "generic" but custom built in each case.
2) how do you know itīs bad?
3) how can you have "83V" on input?
I would expect 120/240V AC or 150/300V DC .
4) please post the schematic so we know what weīre talking about, otherwise "T601" , etc. means nothing.