As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED AIRCRAFTS RADIOS BEGAN TO SHUT DOWN FOLLOWED BY THE INDICATORS BECOMING ERRATIC. PILOT BEGAN TO SHUT DOWN NON ESSENTIAL ELECTRICAL LOADS. ELECTRICAL SYSTEM BEGAN TO OPERATE NORMALLY. PILOT RETURNED TO MAINTENANCE FACILITY AND LANDED WITH NO FURTHER PROBLEMS NOTED. TECH. TROUBLESHOT PROBLEM ISOLATED TRANSISTOR IN POWER REGULATION UNIT. GROUND RUNS SHOWED NO DEFECT AFTER REPLACEMENT.