As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MESSAGE "EPSU EXTERNAL LOAD R" FAULT AT CIDS PANEL WHEN TESTING THE EMERGENCY LIGHTS. TROUBLESHOT IAW TSM 33-51 FOUND FAULT AT RT OVERWING EXIT POWER SUPPLY UNIT. R & R EPSU AT RT WING EXIT IAW AMM 33-51. PERFORMED TEST. OPS CHECKED GOOD.