FireEngine:Screeb: I'm 99% positive that the only thing connected is the Genius.
You could also try simply power off the modem, then unplug the ADSL cable and replug it both at the jackpot and modem end. if it is a slightly corroded jackpot it may wipe the connectors and clean up the connection, no guarantees but you can't do much else until the modem arrives.
I messed about with the connectors a bit before posting the thread (I do have some initiative

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Just did so - connectors (on the cable at least) look perfectly clean. Gave them a good in-and-out and wiggle. Naturally might have a bit of a wait before I can tell if anything's changed, since it has been relatively stable within the last hour.