Hi,
the connectors are not soldered originally.
You can release the connectors from the plug by inserting a needle (better: special tool) from the front end, small recess under the connector. This will release the little hook that prevents the connector from falling out.
Here is a video showing it at a similar connector from 1:15 on:
video 'releasing connectors'Have a very close look at a spade connector:
close connector viewYou get more info, pictures and parts here:
repro-parts faqParts for 914Don't solder the connectors... they have to be crimped, not soldered.
But you need not cut them off or replace them, just 'unclick' them from the plug.
Don't forget to bend the little hooks back when reinstalling the connectors into the plug.
Regards
Norbert