As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON TEAR-DOWN INSPECTION FOR OVERHAUL, FOUND ARMATURE INSULATION DEFECTIVE UNDER COMMUTATOR AT REAR. INSULATION COMING OUT OF ARMATURE - DEFECT, TSN 1120.0. SUBMITTER RECOMMENDS REDESIGNING DEFECTIVE ARMATURE. OPER CONTROL NR XC4R9541832.