As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE PUSH-TO-READ VOLT BUTTON ON THE A.C. VOLT/FREQUENCY METER EASILY BREAKS OFF OR BECOMES LOOSE AND FALLS OFF. SUBMITTER SUGGESTED THE DESIGN NEEDS TO BE IMPROVED. THREE INSTANCES OF THIS PROBLEM HAS OCCURRED ON DIFFERENT AIRCRAFT ON FLEET. (X)