That being said, professional repair of cables means replacing the cable. Spliced cables are generally frowned upon, particularly in an automotive environment where there's some major oxidation and moisture present. One classic problem is where someone has spliced a cable, the joint is fine electrically, but now water comes in between the insulation and the wire. And from there, in through your IP6x-when-mated connectors.

Agree except the last line: Hobbyists without sufficient knowledge or tools to perform repairs of various home electronics is another story... I think this is an ideal place for Hobbyists to gain the knowledge and learn what tools they need. Home electronics are no different from anything else. If a home-brew project then this is a great learning experience. If off-the-shelf equipment then it was at some level (hopefully!) professionally designed and the repair will account for that.

@manassehkatz As I said, it's another story :) Meaning it's a hot potato that will get debated whether or not it is on topic... elsewhere.

Either way, it fits here and hobbyists should not be discouraged. The catch of course is that many consumer electronics are designed to be thrown away rather than repaired. The answer in those cases becomes "To fix that cable you need to do X and Y and Z and it will take you 2 hours, so it isn't generally worth it if a new replacement item will cost you $ 10." But that doesn't make the question a bad question-sometimes the right answer (parent to child or (philosophically) God to human) is "no".