Depending on loads of variables you may be able to scrape some of the
insulation off the 'track' a bit away from the suspected break and
solder a fine wire to it (might not be pretty but can work, paint and
tape over it when finished / tested).

I've done this with a cable in a solid old 1970's computer (a PDP11 I
think).

Lifted the top layer of insulation (mylar?) with a scalpel, flowed a
bit of solder onto the surface, and attached a bit of wire-wrap wire.

Fiddly, and done with the advantages of a lab bench to work on and top
quality tools. Likely to be a good bit trickier in less than ideal
conditions.