Interesting project. Keep in mind that the probe is simply a very small coil with an AB switch. It contains no electronics or means to power it. Keep us updated on your progress. Where there is a will there is a way.
":beerbuddy:roken may be something as easily repaired as a bad AB switch or a broken wire. If it were me, I'd contact Sunray about sending it in for a checkup.
Sunray is a pretty good outfit and may be able to put you back up and running for a relatively small charge.