As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE, INOPERABLE EMERGENCY LIGHT POWER UNIT AT MID CABIN P/N 3400-22-10 S/N 001995 IN PASSENGER CABIN. RESOLVED ON W/O: 1050580 TASKCARD: NR-00009. REMOVED AND REPLACED EMERGENCY LIGHT POWER UNIT AT MID CABIN, IAW 3190 AMM 33-50-01-000-801-A AND AMM 33-50-01-400-801-A. PERFORMED FULL CHARGE OF THE EMERENCY LIGHTS POWER UNITS IAW E190 AMM 33-50-01-800-8.