As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING EMERGENCY LIGHT TEST FAIL MESSAGE EPSU INT LOAD EMER RT APPEARED. IAW FIM 33-51-00-810-807-A, REMOVED AND REPLACED EPSU AND BATTERY 12WL IAW AMM 33-51-38-000-001-A. NO FIX. SUGGEST FURTHER TROUBLESHOOTING OF WIRING PER FIM. CONFIRMED ALL EXIT MARKERS (4) AND ROW 12, 20, 21, & 22 AND RIGHT OVERHEAD EXIT LIGHT BETWEEN ROWS 20 AND 21 ILLUMINATED IAW AWM 33-51-07 AND RIGHT SLIDE ARMED LIGHT IAW AWM 33-51-04. PERFORMED LOAD. FAULT EXTINGUISHED IAW AMM 33-51-00.