Simon, have you diagnosed whether it's the
pickup or just the wiring? If there's a break
at the connector you can have someone solder
it back on for you. The pickup is potted in
epoxy and it's more likely a break would be at
the connector. I'd be happy to check it out for
you but you can probably find someone local
to resolder it.
In case someone can find a match, does it have
ALEMBIC embossed into the working pickup?
EffClef