From post #2...
>>> Just out of interest - how have you determined that it is this component that is faulty? It may not be.
The question still stands...
How have you (or your friend) determined that the LOPT is faulty?
For what is worth, I can add that also in my limited experience of about a dozen 9" 2001/2001N monitor repairs I've never seen a bad flyback. It would be interesting to know how it was tested.
In other CRT monitor repairs I've found one bad flyback in a DEC VT-340 and on a couple of arcade vector monitors.
Commodore issued different versions of the 9" monitors (at least 4 that I have seen) and they have different flyback transformer models (probably only pinout varies on a few of them).