As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHT TEST FAULTING 'R INT LOAD FAULT' & 'R EXT LOAD FAULT' OF RIGHT MID CABIN POWER SUPPLY. REMOVED AND REPLACED RIGHT EMERGENCY POWER SUPPLY UNIT AND RIGHT OVERWING SLIDE BUT NO HELP. FOUND RIGHT OVERWING LIGHT HAD ONE BULB INOP ON FORWARD LIGHT ASSEMBLY. REPLACED BULB AND ALL OPERATIONS WERE NORMAL. VENDOR CONFIRMED FAILURE OF POWER SUPPLY UNIT.