As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE. DURING OPERATIONAL TEST OF THE EMERGENCY LIGHTING SYSTEM, MAINTENANCE MESSAGE SHOWS ESCAPE SLIDE LIGHT EMERGENCY POWER SUPPLY UNIT (13WL) AFT LEFT ESCAPE SLIDE. REPLACED 4L ESCAPE SLIDE PACK ASSEMBLY, PER AMM 25-62-44-400-006-A.