As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTS FAULT, LT OVERWING EED DOOR FAULT ON CMS PANEL. REMOVED CEILING PANEL FOR EPSU 3 & 4. REPLACED EPSU 3 IAW AMP 33-51-01. FAULT CODE 3351F0006 PRESENT ON OMS CURRENT FAULTS. EMERGENCY LIGHTS OPS NORMAL BUT FAULT STILL PRESENT ON CMS. BATTERY INCLUDED IN EPSU ASSEMBLY. REINSTALLED CEILING PANELS PER AMP 25-29. PERFORMED EPSU OP CHECK IAW AMP 33-51. CHECKS GOOD. NO FAULTS ON OMS.