As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ELT HAS CORROSION ON MOUNT FOR THE CASE COVER ATTACHMENT AND ON THE CASE COVER. APPEARS TO BE DISSIMILAR METAL CORROSION FROM COPPER MOUNTING SURFACE AND ALUMINUM MOUNT BRACKET. SUBMITTER STATED TO CORROSION-PROOF MOUNT BRACKET BY PAINTING OR ALODINING.