As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE LAST 15 VESTS INSPECTED HAVE HAD BAD LIGHTS (SWOLLEN BATTERIES). ALL OF THE LIGHTS ARE FROM THE SAME BATCH MAR 97 AND ARE ONLY 6 MONTHS FROM DATE OF MANUFACTURE. SUBMITTER STATED BATTERIES FROM OCT 96 ARE ALL FINE, IT JUST SEEMS TO BE A BATCH PROBLEM.