Electric Sky, Yes this subject has come up quite a bit in the various fora, a quick search (the search function link is at the top right of each page) came up with:
Old jets' wires may be riddled with cracks: and
kapton wiring - death by wire on the
Tech Log Forum, and:
IASA Conference - Aircraft Wiring Concerns,
Scarry stuff [sic],
More on the Kapton wiring problem...,
Kapton wiring....no longer used????,
WHERE THERE'S SMOKE......., and
Swissair 111 - TSB Recommendations on
Rumours and News, amongst many others.
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Tech Log forum moderator