As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OPERATIONAL CHECK OF CABIN EMERGENCY LIGHTS {A3NB-33-3-6012} - SYS OK LIGHT DOES NOT COME ON AFTER TEST. EPSU BATTERY AFT L 33-51-58. EPSU COMM AFT L. 33-51-38 R/R EPSU BATTERY AT EPSU 13WL WITH A SERVICABLE UNIT FROM A/C 4046 REF AMM 33-51-38. OPS CHECKS OK