My 30 SXi is about 4 years old. A few months ago it shut down with an
F13 "Main PCB conncection fault" - fixed by jiggling all the connectors.
Yesterday it did it again but required much more jiggling and will now
only run if the controls fascia is unclipped and dangling.

ISTM that the obvious "next steps" are to check the pcbs for dry joints,
cracks and corrosion, and to check all the wire crimps.
Anything else?

Is this a common problem?
Is there any way to interrogate the board to find out which connection
it's worried about?

Dave