Thanks for the suggestion.

No, couldn't try a pot. There were two damaged resistors in series with
the primary of the power transformer. The fuse had blown but there were
no shorted semiconductors or caps. Due to the issues of safety and
reliability, I wanted to repair the unit to factory specs. Especially
with subwoofers being left powered up on standby all the time.

Another side of the issue is that we guarantee our repairs. If we
repair a unit we need to know we can get parts to fix it if it comes
back with another problem.