As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED COMPLETE AIRCRAFT ELECTRICAL POWER FAILURE. ATTEMPTS TO LOWER LANDING GEAR USING BOTH NORMAL AND EMERGENCY PROCEDURES FAILED. ELECTRICAL POWER FAILURE WAS TRACED TO A FAILED VOLTAGE REGULATOR, TOTAL HOURS 450. LANDING GEAR EMERGENCY EXTENSION LEVER DID NOT DEPRESS FULLY TO ALLOW MANUAL RELEASE OF HYDRAULIC PRESSURE TO PERMIT THE GEAR TO FREE FALL. A MOLDING COVER TRIM RETAINING SCREW BACKED OUT RESTRICTING FULL LEVER MOVEMENT.