As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EPSU TEST FAILED. CORRECTIVE ACTION: EPSU TEST FAILED SHOWED (14WL) EMERGENCY POWER SUPPLY AND BATTERY. R & R (14WL) EMERGENCY POWER SUPPLY AND BATTERY. OPERATIONS CHECKS GOOD, REF AMM 33-51-38-400-001-A AND 33-51-38-400-002A. BOND METER F9TAB4051C DUE 07/21.