As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING INSPECTION THE L-2 & R-2 DOOR EMERGENCY EXIT EXTERIOR LIGHTS DID NOT ILLUMINATE. MAINTENANCE REMOVED AND REPLACED THE AFT ESCAPE SLIDES BATTERY BACK IN THE AFT CARGO COMPARTMENT BS 920 IAW BMM 33-51-71, OPERATIONAL CHECK C/W IAW BMM 33-51-11.