As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT SUFFERED A SHORT-TERM, COMPLETE ELECTRICAL SYSTEM FAILURE WHILE IN IFR CONDITIONS ON A NIGHT FLIGHT. ELECTRICAL SYSTEM BEGAN FUNCTIONING NORMALLY AGAIN AFTER AIRCRAFT RETURNED TO NON-PRECIP. VFR. SUSPECT CAUSE IS MOISTURE ENTERING AVIONICS COMPARTMENT. SUBMITTER RECOMMENDS BETTER SEAL FOR AVIONICS COMPARTMENT HATCHES.