As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE: 15WL BATTERY FAULTED. REMOVED AND REPLACED THE BATTERY IAW AMM 33-51-38-000-002-A/ 400-002-A. PERFORMED AN OPS CHECK IAW AMM 33-51-00-710-001-A. OPS CHECKED OK. PERFORMED CIDS IAW 23-73-00-740-005-B. TESTED OK. WORK ACCOMPLISHED ON WO W004054 NR N1076.