As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TERMINAL BLOCK LUG FASTENER SHEARED. THE SCREWS USED TO ATTACH THE TERMINAL LEADS TO THE LUGS ARE DIFFICULT TO MANIPULATE WITHOUT SPECIAL TOOLS. SUBMITTER SUGGESTED USING ALLEN HEAD SCREWS ON TERMINALS AND INCLUDE TORQUE PROCEDURES FOR PROPER INSTALLATION.