As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MDIS 686 33-50 1477 14JAN22 BUR FACT U EMERGENCY LIGHTS FOR L1 AND L2 DOORS AND COURIER AREA INOP. R/I 14JAN22 15:14 BUR U REASON CODE : PREMATURE REMOVAL/INSTALLATION OFF MPN: AD-3214-30 POS: 3 SRL: 88700 TAG NBR: 423G32 ON MPN: AD-3214-31 CPN: 3310373 SRL: 243729 TAG NBR: 3H4836 FACT 14JAN22 15:14 BUR U REMOVED AND REPLACED EPSU (29WL1) BATTERY PACK LOCATED BY L1 DOOR PER M/M 33-51-14-04. SYSTEM OPS CHECKS NORMAL.