As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TAIL COMPARTMENT WALKWAY CENTER EMERGENCY LIGHT OUT. REFERENCED WDM 33-51-13. FOUND NO POWER AT LAMP. REPLACED BATTERIES IN POWER SUPPLY B5-28 (LOCATED IN AFT RIGHT LAVATORY CEILING). OPS CHECK OK. PN'S OFF AND ON TWO 41B004AD07G3 BATTERIES.