As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE EN ROUTE, LOST COMPLETE ELECTRICAL POWER IN TOTAL IFR CONDITIONS WITH ZERO VISIBILITY. PWM MAINTENANCE COULD NOT DUPLICATE THE PROBLEM. AIRCRAFT DEPARTED AND THE SAME CONDITION OCCURRED AGAIN. THE CIRCUIT BREAKER WAS REPLACED AND THE CONDITION WAS NEVER DUPLICATED AGAIN. FOUND ALTERNATOR OUTPUT CIRCUIT BREAKER KEPT TRIPPING AT A LOAD WELL BELOW ITS RATED VALUE. UNSURE HOW THIS COULD BE PERIODICALLY CHECKED IN THE FIELD.