Unfortunately, the USB power supply is not all that got damaged by the water leak:
There’s a blueish sludge on the RJ12 jack. Presumably some copper salt caused by humidity and corrosion. This is a little JeePlug board on top of a JeeNode, which is used to detect pulses from three different 2000 pulse/kWh counters. This is what it looked like three and a half years ago:
The Arduino IDE based code it was running is on GitHub.
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