I keep looking at this sub-section and no-one, including myself, seems to have come up with a request for anything tecthnical .

It is making me wonder whether in fact there is anything technical about A/C or are we all too clever for our own good?

Most of the potential problems have propably already been discussed elsewhere under TEVs or cap tubes and of course filter/driers.

I suppose the tricky bits are the electronics and as most people just replace a faulty part you can't really call changing wires and plugs technical can you?