As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MDIS 682 33-50 0400 19DEC21 MEM FACT U EMERGENCY LIGHTS NOT WORKING. R/I 19DEC21 20:26 MEM U REASON CODE : PREMATURE REMOVAL/INSTALLATION OFF MPN: AD-3214-30 POS: 3 SRL: 120148 TAG NBR: 28H905 ON MPN: AD-3214-31 CPN: 3310373 SRL: 278291 TAG NBR: J58300 FACT 19DEC21 20:26 MEM U REMOVED AND REPLACED EMERGENCY LIGHT POWER SUPPLY BATTERY 29WL REF AMM 33-51-14-04. OPS CHECKS GOOD. A/C OK FOR SERVICE.