There's several, take each plug/connector coming out/going into the clock binnacle, check and clean every connector both sides, using the wiring diagram check for continuity on the grounds. It's possible you may have got water ingress into one or more of the plugs/connectors, it may have corroded a pin/s to the point they lose ground.
It's also possible if it bad enough that it's corroded away a pin's or blow some of the internal boards, unlikely but possible. If that's the case you'll be looking at replacement, unless you've got the kit, components and know how to repair it.