
How about some bright spark having had the idea to spray WD-40 into the cables to improve the shifting action? I hate that stuff because it's hygroscopic so while it initially attracts moisture away from other things (like ignition circuits) it keeps attracting moisture until it's fully saturated - so then you've got a little water reservoir wrapped round everything that it's been sprayed on, just waiting to freeze up.
I claim expert knowledge, having run Alfasuds through British winters - the combination of salt sprayed on British roads, Italian electrics, long plug leads to the flat-four cylinder heads and long intake tracts from a single central carburettor made starting one of these a horrendous task that some people were dumb enough to use WD-40 to 'help', thereby building up a guaranteed problem for the future.