As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. DURING OPERATIONS TEST OF EMERGENCY LIGHTS - EMERGENCY LIGHTS INOPERATIVE AT RIGHT HAND OUTWING EXIT SIGN AND FORWARD FACING AISLE EXIT SIGN. REPLACED EMERGENCY POWER SUPPLY UNIT BATTERY PACK (12WL) PER CMM 33-51-38. OPERATIONS CHECK GOOD.